C#

Should I use an abstract class or an interface?

arvindharitus — Tue, 24 Nov 2009 05:49:58 GMT

Hi All,

I know all the difference and similaerty of abstract class and Interface,

but i want to know that what are the senerio in which i should use the abstract class

and what are the senerio in which i have to use an Interface.

-Arvind

IENumerator does not have 'Key'

asusudev@live.com — Tue, 24 Nov 2009 06:38:17 GMT

Hello everybody,

I have had this problem when I used IENumerator. Please gives me some advices.

Thank you.

Here's my code:

using System;
using System.Collections;

public partial class Total : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        //Create 3 ArrayLists to contain 3 teams
        ArrayList Team1Arr = new ArrayList();
        ArrayList Team2Arr = new ArrayList();
        ArrayList Team3Arr = new ArrayList();

        Hashtable ProjectsHt = new Hashtable();

        Team1Arr.Add("Andy");
        Team1Arr.Add("Judy");
        Team1Arr.Add("Scott");

        Team2Arr.Add("Tek");
        Team2Arr.Add("Wood");

        Team3Arr.Add("Sol");
        Team3Arr.Add("Tilo");
        Team3Arr.Add("Paolo");

        //Add each team to Hasttable
        ProjectsHt.Add("Prototyping", Team1Arr);
        ProjectsHt.Add("Coding", Team2Arr);
        ProjectsHt.Add("Testing", Team3Arr);

        //Now, list each project
        IEnumerator enumProject = ProjectsHt.GetEnumerator();

        while (enumProject.MoveNext())
        {
            ResultLabel.Text += enumProject.Current.Key;
        }

    }
}

And error is from this line: ResultLabel.Text += enumProject.Current.Key;

How to iterate thru HashTable?

yrb.yogi — Mon, 23 Nov 2009 13:29:44 GMT

Hi all,

I am adding object and string in keyvalue pair to Hashtable.

Now I have to iterate thru the hashtable and in each loop i have to use my object to do some business logic..

I have found lots of example but for me its not working...

One important thing is that i m adding dictionay in hashtable..

I am iterating as :

foreach (KeyValuePair<Dictionary<string, string>, string> entry in insertTable)
{
    if (Convert.ToString(entry.Value) == "Master")
    {
        Dictionary<string, string> mydic = (Dictionary<string, string>)entry.Key;
        if (mydic != null)
        {
            foreach (KeyValuePair<string, string> item in mydic)
            {
                MessageBox.Show(item.Key + "," + item.Value);
            }
        }
    }
}

now i m getting error as "specified cast is not valid."...

any guidance towards this problem?

C# boolean statement for multiple conditions

rtcary — Tue, 24 Nov 2009 05:16:51 GMT

I would like to avoid using multiple if statements for this kind of statement as done PHP, but have it in C#:

$ua= 'this is a test statement with many words';

$isTrue = strpos($ua, 'test') !== false
        || strpos($ua, 'with) !== false
        || strpos($ua, 'words') !== false
        || strpos($ua, 'many') !== false
        || strpos($ua, 'mobile') !== false;

IndexOf is the replacement of strpos and != replaces the !==, but I am not sure how to set up the ||'s.

Thank you...

Todd

Zip a Folder and Files

tummurugoti — Mon, 23 Nov 2009 18:18:34 GMT

I am looking to Zip a Folder which is having some more folders and files inside it. I want to zip All the files and Subfolders and files in the subfolders. Could some one help me on these. I am using ASP.NET and C#. I tried System.IO.Compress but I am unable to Zip the Folder, I can only zip files.

Thank you

Suman

Writing in a text file with delimiter.

SomaCha — Mon, 23 Nov 2009 17:57:20 GMT

Hi,

In my application, after retriving data from database, user will write it in a text file with "|" delimiter in ASP.net 2.0 using C#. Please help me on that.

String manipulation

oleanganesh — Mon, 23 Nov 2009 17:24:55 GMT

I have a sharepoint list item which holds data from a multiselect box. This string has sharepoint generated id with the listbox item names in the following format.

79;#item1;#81;#item2;#47;#item3

How can i extract the listbox item name alone from the string and store in arraylist.

eg: arrlist.add("item1");

arrlist.add("item2");

arrlist.add("item3");

Thanks

Gane

Problem converting class objects: 'Cannot convert from TWS.Category to Tickets.Category'

RonnieK — Tue, 02 Jun 2009 04:19:24 GMT

Hello,

I've added a web reference and consumed a Web Service and I'm trying to bring various classes and methods from the service locally and handle client-side caching.

In one of the web service methods, it returns an int, string and a sub-object of type Category. When doing the conversion from the TWS (Web Service) to my local objects, I'm getting an error converting the sub-object of Web Service Category to the local Category object I created.

'Cannot convert from TWS.Category to Tickets.TCategory':

      private static TPerformer GetTPerformerFromTWSPerformer(TWS.Performer record)
      {
         if (record == null)
            return null;
         else
         {
            return new TPerformer(record.Description, record.ID, record.Category);
         }
      }

      private static List<TPerformer> GetTPerformerListFromTWSPerformerList(List recordset)
      {
         List performers = new List();
         foreach (TWS.Performer record in recordset)
            performers.Add(GetTPerformerFromTWSPerformer(record));
         return performers;
      }

If I remove the record.Category object from the return, and remove it from from the constructor of my local Category Class and only return Description and ID then it works. I'm having a hard time converting and returning an object of type Category.

Assistance is much appreciated,

Ronnie

null error

viki_singh — Fri, 29 May 2009 07:12:10 GMT

Hi,

I am having a table where 2 colmns are composite key, i am fetching the query using hibernate. I am getting null vlaue in 2nd coulmn and getting error.

protected void FillFundGroup()

{

config = new NHibernate.Cfg.Configuration();config.AddAssembly(typeof(CSTS.Main.FundGroup).Assembly);

factory = config.BuildSessionFactory();

session = factory.OpenSession();

ICriteria criteria = session.CreateCriteria(typeof(FundGroup));

criteria.SetProjection(Projections.Distinct(Projections.ProjectionList()

.Add(Projections.Alias(Projections.Property("Acct_Grp_Cd"), "Acct_Grp_Cd"))));

criteria.SetResultTransformer(new NHibernate.Transform.AliasToBeanResultTransformer(typeof(FundGroup)));IList fundgroup = criteria.List();

ddFundGroup.DataSource = fundgroup;

ddFundGroup.DataTextField = "Acct_Grp_Cd";

ddFundGroup.DataValueField = "Acct_Grp_Cd";

ddFundGroup.DataBind();

ddFundGroup.Items.Insert(0, new ListItem("", ""));

}

I am having .cs file to get set value.

public override bool Equals(object obj)

{

if (obj is FundGroup)

{

FundGroup a = (FundGroup)obj;

if (a._Acct_Grp_Cd == _Acct_Grp_Cd && a._Acct_Cd == _Acct_Cd)

return true;

}

return false;

}

public override int GetHashCode()

{

return _Acct_Grp_Cd.GetHashCode() ^ _Acct_Cd.GetHashCode();

}

I am getting error in GetHashcode..

updating calling web page variable from threading

wilsonwu — Mon, 23 Nov 2009 15:59:19 GMT

Hi,

i created threads in a web page. how can i update a variable from thread?

string WantBeUpdate = "";

Thread t = new Thread(new ThreadStart(Class1.run));

public class Class1 {

public Class1() {

}

public void run() {

defaultPage.WantBeUpdate = "updated"; //don't how to reference the calling page variable

}

Thanks

Wilson

C#

shantanu.gupta — Mon, 23 Nov 2009 13:55:20 GMT

How can i add line break in C# coding section so that i can continue the same coding in next line ?

How to write this in c#?

wilsonwu — Mon, 23 Nov 2009 09:24:27 GMT

hi,

i want to know how to rewrite this in c#.

Dim t As Thread = SimpleThread.CreateThread(AddressOf Worker.WorkerMethod, 51)

Thanks

Wilson

Dynamic execute an expression like Convert.ToDecimal("123");

wilsonwu — Mon, 23 Nov 2009 06:39:44 GMT

Hi,

Is there a way to execute an expresss like Convert.ToDecimal("123")?

Thanks in advance

Wilson

Problem with rounding off the decimal value in c#

mmknitin — Mon, 23 Nov 2009 07:03:44 GMT

Hello all,

I m facing a problem with rounding off the decimal value for e.g. if my number of records are 21505 and if i m dividing it by 5000 the ans comes to 4.301 then if i use Math.Round in c# it gives me the ans 4 that is correct by i want the ans to be 5 i.e. anything is in decimals it should be plus one. Please help

How to delete file from folder in C# & Asp.net

Niranjancw — Thu, 19 Nov 2009 07:03:05 GMT

hello,

i m creating file and for that i have write code like

FileStream fs = File.OpenWrite("\\TempFileSave\\" + AttachFileName);

fs.Write(AttachFile.ToArray(), 0, AttachFile.ToArray().Length);

fs.Close();

Attachment attach = new Attachment("\\TempFileSave\\" + AttachFileName);

//attach.TransferEncoding = System.Net.Mime.TransferEncoding.Base64;

//attach.ContentId = "FileID";

//fs.Close();

// Add the file attachment to this e-mail message.

msg.Attachments.Add(attach);

FileStream fs = File.OpenWrite("\\TempFileSave\\" + AttachFileName); //Save the File in TempFileSave folder

fs.Write(AttachFile.ToArray(), 0, AttachFile.ToArray().Length);

fs.Close();

Attachment attach = new Attachment("\\TempFileSave\\" + AttachFileName);

msg.Attachments.Add(attach); // Add the file attachment to this e-mail message.

now what i simply want to do is when the attach ths file then it will be deleted from folder.

Plz Giv me a code..

Thnx

Niranjan.

[Ask] Runtime Eval in c#/.net

yunuzzz — Mon, 23 Nov 2009 08:40:53 GMT

How do i execute expression in c#?

Examples:

= Eval("1+2")
= Eval("MyClass.MyPublicConst")
= Eval("MyNamespace.MyClass.MyStaticProperty")
= Eval("MyClass.MyGetMethod()")
= Eval("MyClass.MyStaticProperty[3].ToString()")

or someone can completing my code below:

public partial class RuntimeDefaultValueAttribute : DefaultValueAttribute
{
    public RuntimeDefaultValueAttribute(string expression)
        : base(expression)
    {
    }


    public override object TypeId
    {
        get
        {
            return typeof(DefaultValueAttribute);
        }
    }


    public override object Value
    {
        get
        {
            try
            {
                return Eval((string)base.Value);
            }
            catch
            {
                return null;
            }
        }
    }


    protected virtual object Eval(string expression)
    {
        // HELP ME PLEASE....
    }
}

Does not find entity???

rchiu5hk — Mon, 23 Nov 2009 03:03:54 GMT

Dear all,

I have the project with source code in which I do not find any entity for some table such as BOM.

Do you know why and tell me how to do if I want to add one more field??

-----------------------------------------------------------------------------------

using System;
using System.Xml.Serialization;
using System.Collections;
using System.Collections.Generic;

namespace QI.BLL.WMS
{
    public   partial class BOM : BaseWMS
    {
        #region ListBOM custom collection
        public   partial class ListBOM : List<BOM>
        {
            public   ListBOM () { }
        }

        private static ListBOM converter(BOM[] objects)
        {
            ListBOM list = new ListBOM();
            foreach (BOM obj in objects)
            {
                list.Add(obj);
            }
            return list;
        }

#endregion

        #region constructors
        public BOM()
        {
        }

        public BOM(Int64 productID, Int64? assemblyID, int qty, int rootQty, int level, string path, DateTime? updatedDate)
        {
            this.ProductID = productID;
            this.AssemblyID = assemblyID;
            this.Qty = qty;
            this.RootQty = rootQty;
            this.Level = level;
            this.Path = path;
            this.UpdatedDate = updatedDate;

        }

        public BOM Clone()
        {
            BOM newBOM = new BOM(
                this.ProductID,
                this.AssemblyID,
                this.Qty,
                this.RootQty,
                this.Level,
                this.Path,
                this.UpdatedDate);
            return newBOM;
        }
        #endregion

        private BOM.ListBOM _bomlist = null;
        /// <summary>
        /// Nothing fetch from Database, ita a temparary Property for Presentation Purpose.
        /// </summary>
        public BOM.ListBOM ChildBOM
        {
            get
            {
                if (_bomlist == null)
                    _bomlist = new ListBOM();

                return _bomlist;
            }
            set
            {
                _bomlist = value;
            }
        }

#region BOM

        public static BOM.ListBOM GetBOMs()
        {
            return GetBOMs("", 0, MAXROWS);
        }

        public static BOM.ListBOM GetBOMs(string sortExpression, int startRowIndex, int maximumRows)
        {
            return converter(WMSServiceProxy.GetBOMs(sortExpression, startRowIndex, maximumRows));
        }

        public static int GetBOMsCount()
        {
            return WMSServiceProxy.GetBOMsCount();
        }

        public static BOM.ListBOM GetBOMByProductID(Int64 ProductID, string sortExpression, int startRowIndex, int maximumRows)
        {
            return converter(WMSServiceProxy.GetBOMByProductID(ProductID, sortExpression, startRowIndex, maximumRows));
        }

        public static int GetBOMByProductIDCount(Int64 ProductID)
        {
            return WMSServiceProxy.GetBOMByProductIDCount(ProductID);
        }

        public static BOM.ListBOM GetBOMsAssemblyID(Int64 productSupplimentID)
        {
            return GetBOMsAssemblyID(productSupplimentID, "", 0, MAXROWS);
        }

        public static BOM.ListBOM GetBOMsAssemblyID(Int64 productSupplimentID, string sortExpression, int startRowIndex, int maximumRows)
        {
            return converter(WMSServiceProxy.GetBOMsAssemblyID(productSupplimentID, sortExpression, startRowIndex, maximumRows));
        }

        public static int GetBOMsAssemblyIDCount(Int64 productSupplimentID)
        {
            return WMSServiceProxy.GetBOMsAssemblyIDCount(productSupplimentID);
        }

        public static int GetMaxBOMLevelByAssemblyID(Int64 productSupplimentID)
        {
            return WMSServiceProxy.GetMaxBOMLevelByAssemblyID(productSupplimentID);
        }

        public static BOM.ListBOM GetBOMsProductID(Int64 productSupplimentID, string sortExpression, int startRowIndex, int maximumRows)
        {
            return converter(WMSServiceProxy.GetBOMsProductID(productSupplimentID, sortExpression, startRowIndex, maximumRows));
        }

        public static BOM.ListBOM GetBOMsByComponent(Int64 productSupplimentID)
        {
            return converter(WMSServiceProxy.GetBOMsByComponent(productSupplimentID));
        }

        public static int GetBOMsProductIDCount(Int64 productSupplimentID)
        {
            return WMSServiceProxy.GetBOMsProductIDCount(productSupplimentID);
        }

        public static BOM GetBOMByID(Int64 productID, Int64 AssemblyID)
        {
            return WMSServiceProxy.GetBOMByID(productID, AssemblyID);

}

        public static int InsertBOM(Int64 productID, Int64? assemblyID, int qty, DateTime? updatedDate)
        {
            return WMSServiceProxy.InsertBOM(productID, assemblyID, qty, updatedDate);
        }

        public static bool UpdateBOM(Int64 productID, Int64? assemblyID, int qty, DateTime? updatedDate)
        {
           BOM bom = new BOM();
             bom.ProductID =productID;
             bom.AssemblyID = assemblyID;
             bom.Qty = qty;
             bom.RootQty =0;
             bom.Level =0;
             bom.Path="";
             bom.UpdatedDate =updatedDate;

             return UpdateBOM(bom);
        }

        public static bool UpdateBOM(BOM bom)
        {
            return WMSServiceProxy.UpdateBOM(bom);
        }

        public static bool DeleteBOM(Int64 productID)
        {
            return WMSServiceProxy.DeleteBOM(productID);
        }

        public static bool DeleteBOMByProductAssemblyID(Int64 productID, Int64 assemblyID)
        {
            return WMSServiceProxy.DeleteBOMByProductAssemblyID(productID, assemblyID);
        }
        #endregion
    }
}

System.Array.Copyto vs System.Array.Clone in C#

dotnetrox — Sat, 21 Nov 2009 22:09:27 GMT

What's the difference between the two?

hi

nowsathkhan — Wed, 28 Oct 2009 14:10:11 GMT

hi to all

iam getting error when difference of date

that means get subtract from system date

error:String was not recognized as a valid DateTime.

DateTime dt = DateTime.Now;
string ff=dt.ToString("dd/MM/yyyy");

string sr = txt_cdat.Text;
        DateTime d1 = Convert.ToDateTime(sr);
        DateTime d2 = Convert.ToDateTime(ff);   //error::String was not recognized as a valid DateTime.
        TimeSpan diff = d2.Subtract(d1);
        int days = diff.Days;

setting a breakpoint in a cs file

Ganesh@Nilgris — Thu, 19 Nov 2009 16:52:47 GMT

This is my scenerio

I need to load a test case file "student.cs" which contains 2000 test cases. I need to manually find the word "Assert.areEqual' and set a breakpoint

I want to automate this process and need to set the breakpoint automatically in the line "Assert.AreEqual';

Any ideas..

swap code problem

getchinna_sv — Fri, 20 Nov 2009 15:31:21 GMT

what is wrong with this code....

class Program
    {
        public static void Swap(ref string a, ref string b)
        {
            Object t = b;
            b = a;
            a = b;            
        }
        static void Main(string[] args)
        {
            string s1 = "FirstString";
            string s2 = "SecondString";
            Swap(ref s1,ref s2);
            Console.WriteLine(s1);
            Console.WriteLine(s2);
            Console.ReadLine();
        }
    }

How to delete MSChart series using C#?

dashbored — Wed, 18 Nov 2009 21:38:20 GMT

I'm working with an MSChart control using C#, and I need to be able to delete a series. Can anyone tell me how to do that? I've looked everywhere and I can only find pointers in how to build charts.

Thanks!

dashbored

Injecting properties/fields into the existing type at runtime

davidlars99 — Wed, 18 Nov 2009 18:25:44 GMT

Hi,

Is it possible to inject properties/fields into the existing type at runtime? I know how to create a class dynamically and subclass it with an existing one, but that's not what I'm after. I have endlessly serched the web and everyone says "yes, it is possible, but I wouldn't recommend it", but nobody seems to know how it is done - Do you? :)

Thanks,

David

Tree view check null nodes ?

Umair Aslam Bhatti — Fri, 20 Nov 2009 04:46:11 GMT

Hi can any body tell me how to check null nodes in tree view i try

trvMenu.Nodes[0].Nodes[1].Equal(null)

not working

(trvMenu.Nodes[0].Nodes == null)

not working

my trvMenu.Nodes[0].Nodes[0]

trvMenu.Nodes[0].Nodes[1]

populates from database when Node[1] is absent the code collapse so i have to put if condition how can i check that child node is null ? my tree view is some thing like this

Root>File

>File1

>File2

>Attachment

>Attachment1.txt

>attachment2.doc

File node is present then Attachment node is vacant i fill it from data base

please help thanx in advance.

need C# linked list problem solution

su.rameshraj — Thu, 19 Nov 2009 10:42:58 GMT

I have a problem for which I need a solution.

Write a C# program to perform the following operations on a linked list of studetns containing USN and name

1. Insert an element to the front of the list

2. Delete the front element from the list

3. Insert an element to the end of the list

4. Delete an element at eh end of the list

Hope some one will help

thanks

have a nice day

C#

Should I use an abstract class or an interface?

IENumerator does not have 'Key'

How to iterate thru HashTable?

C# boolean statement for multiple conditions

Zip a Folder and Files

Writing in a text file with delimiter.

String manipulation

Problem converting class objects: 'Cannot convert from TWS.Category to Tickets.Category'

null error

updating calling web page variable from threading

C#

How to write this in c#?

Dynamic execute an expression like Convert.ToDecimal("123");

Problem with rounding off the decimal value in c#

How to delete file from folder in C# & Asp.net

[Ask] Runtime *Eval* in c#/.net

Does not find entity???

System.Array.Copyto vs System.Array.Clone in C#

hi

setting a breakpoint in a cs file

swap code problem

How to delete MSChart series using C#?

Injecting properties/fields into the existing type at runtime

Tree view check null nodes ?

need C# linked list problem solution

[Ask] Runtime Eval in c#/.net