datagrid.Items.Count to GridView.Rows.Count

I have migrated an asp.net 1.1 to 2.0 web application.

I'm having trouble with a particular page where I have replaced the DataGrid with a GridView. I have the following 1.1 code that worked nicely:

for ( int i=0; i <datagrid.Items.Count; i++)
{

  DataGridItem  _item = datagrid.Items[i];

  TextBox txt_M1=(TextBox)(_item.FindControl("txtM1"));
  TextBox txt_M2=(TextBox)(_item.FindControl("txtM2"));
  TextBox txt_M3=(TextBox)(_item.FindControl("txtM3"));

  //check to make sure each textbox contains only numbers
  //...
}

I'm trying to do the equivalent with this code:

//Loop through GridView Items
foreach (GridViewRow grdRow in grid.Rows)
{
  TextBox txt_Day = (TextBox)(grdRow.FindControl("txtDay"));
  TextBox txt_M1 = (TextBox)(grdRow.FindControl("txtM1"));
  TextBox txt_M2 = (TextBox)(grdRow.FindControl("txtM2"));
  TextBox txt_M3 = (TextBox)(grdRow.FindControl("txtM3"));  

  //check that each textbox contains only numbers
  //...
}

The problem with the code above is that the grid.Rows.Count equals 0.  I can see the data so I know that can't be correct.  Am I using the right property (Rows) to iterate through the grid?

Any help would be greatly appreciated.

Thanks, Bill N

Re: datagrid.Items.Count to GridView.Rows.Count

I gave it a try, it seems to work for me. if grid refers to your Gridview instance, and if it has been filled with data ( through an objectDatasource or by any other means) , it should work. do you have more snippet of the code behind?

Re: datagrid.Items.Count to GridView.Rows.Count

Hi Bill,

Could you let me know which event handler have you put your code in? You can see the data when it is loaded at Page_Load event. But when you click a button to post it back, the data might be lost since the whole page is reloaded.

You have to make sure that DataBind() method is called before you check for row count.

Re: datagrid.Items.Count to GridView.Rows.Count

Thanks for the reply.

Yes it is a button click event that triggers the code. When I do check even the GridView columns count it is 0 so I'm losing the data. The confusing part though is that this code worked in asp.net 1.1. The only difference is that I'm using AJAX (http://ajax.asp.net/).

I can't call DataBind() because I have text boxes that are edited and I want to check the user's input first (ensure only numbers entered) and then save the items to a DataTable as shown below:

public DataTable getUpdatedDatagrid(GridView grid,DataTable dt1,int userId)
{
	try
	{
        	//Loop through GridView Items
                foreach (GridViewRow grdRow in grid.Rows)
                {
                    TextBox txt_Day = (TextBox)(grdRow.FindControl("txtDay"));
                    TextBox txt_PremiseID = (TextBox)(grdRow.FindControl("txtPremiseID"));
                    TextBox txt_M1 = (TextBox)(grdRow.FindControl("txtM1"));

                    DataRow dr = dt1.NewRow();
                    dr[0] = userId;
                    dr[1] = Convert.ToInt32(txt_Day.Text.Trim());
                    dr[2] = Convert.ToDecimal(txt_PremiseID.Text.Trim());
                    dr[3] = Convert.ToDecimal(txt_M1.Text.Trim());
                   

                    dt1.Rows.Add(dr);
                }
	}
       catch (Exception ex)
	{
	        Session["CurrentError"] = ex.Message;
		Server.Transfer("Errorpage.aspx");
	}
	return dt1;

}

I'm not using the ObjectDataSource or SQLDataSource because I'm inheriting this project and I'm thinking it would be a bigger project to change the code rather than just modifying the existing code.

Any help would be greatly appreciated.

Thanks, Bill N

Re: datagrid.Items.Count to GridView.Rows.Count

Hi,

Please check if ViewState has been enabled. By default all data is cached in ViewState, and data will be loaded before entering the button.click event handler.

Re: datagrid.Items.Count to GridView.Rows.Count

Kevin Yu - MSFT

Hi,

Please check if ViewState has been enabled. By default all data is cached in ViewState, and data will be loaded before entering the button.click event handler.

Utter nonsense. Not all data is cached in ViewState by default or otherwise.

Re: datagrid.Items.Count to GridView.Rows.Count

Okay figured out the problem (unfortunately not the solution). I'm using dynamic template in my GridView. (I know I should have mentioned that in my previous posts [;)]There seems to be a problem in that it doesn't post back the items in the grid. I don't know why.

If worse comes to worse the Items are in the Request.Form.AllKeys and I could parse that out but I was hoping to find a cleaner solution.

Any help would be appreciated, Bill N

Re: datagrid.Items.Count to GridView.Rows.Count

Hi Bill,

I assume that the item templates were not re-created after post back. Is this what you mean in your last post?

I check the code from CodeProject, it calls loadDynamicGridWithTemplateColumn() each time page loads. Because the page doesn't contains template information, since it is created at runtime.

Are you calling your template creation method every time page loads? If you have problems checking this, please post your Page_Load() event handler. Thanks!

Re: datagrid.Items.Count to GridView.Rows.Count

Could I please see your complete code in order to help you further.