create a dropdownlist..

I'm a novice in asp.net. I'm trying to create a modal calculator that has a dropdownlist. Dropdown list has number 1-14. if i choose any of the numbers i will be able to have same number of textbox for data entry. thank you

Re: create a dropdownlist..

This is not easy to do, I worked on a project like this for over a month to finally figure it out, but I got it working....

You need to do this in the pageInit event because you need to repeat it on every post back to redisplay the controls. There is a pretty good tutorial on teh fourguysfromrolla web site.

For I = 1 To 15

                ' ***************************************************
                ' * Build English Header
                Dim lstD As New DropDownListBox
                lstD.ID = "lstDEdit" & I.ToString("D2")
                ph.Controls.Add(lstD)    ' ph = Placeholder in Gridview to locate the control

                Dim litCtrlD As New Literal
                litCtrlD.ID = "litCtrlD" & I.ToString("D2")
                litCtrlD.Text = "<br />"
                ph.Controls.Add(litCtrlD)

                
                ' ***************************************************
                ' * Build English DropDownListBox
                Dim lstA As New DropDownListBox
                lstA.ID = "lstAEdit" & I.ToString("D2")
                ph.Controls.Add(lstA)

                Dim litCtrla As New Literal
                litCtrla.ID = "litCtrla" & I.ToString("D2")
                litCtrla.Text = "<br />"
                ph.Controls.Add(litCtrla)
Next

Look up working with Literal controls..

My project requried textbox not DDLs though.

Re: create a dropdownlist..

I would recommend you to go through this post to understand about creating and accessing controls dynamically

http://aspnet.4guysfromrolla.com/articles/092904-1.aspx

http://www.aspnettutorials.com/tutorials/controls/control-dym-aspnet2-csharp.aspx

http://ranafaisal.wordpress.com/2009/02/17/dynamically-adding-removing-textboxes-in-aspnet-repeater/

Re: create a dropdownlist..

Hey

First Create a Dropdown with 14 listitems and take a PLACEHOLDER where the textbox will be created.

Code at Default.aspx page is:

<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True"
onselectedindexchanged="DropDownList1_SelectedIndexChanged">
<asp:ListItem>1</asp:ListItem>
<asp:ListItem>2</asp:ListItem>
<asp:ListItem>3</asp:ListItem>
<asp:ListItem>4</asp:ListItem>
<asp:ListItem>5</asp:ListItem>
<asp:ListItem>6</asp:ListItem>
<asp:ListItem>7</asp:ListItem>
<asp:ListItem>8</asp:ListItem>
<asp:ListItem>9</asp:ListItem>
<asp:ListItem>10</asp:ListItem>
<asp:ListItem>11</asp:ListItem>
<asp:ListItem>12</asp:ListItem>
<asp:ListItem>13</asp:ListItem>
<asp:ListItem>14</asp:ListItem>
</asp:DropDownList>

Code at Default.aspx.cs file will be:

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
PlaceHolder plc1 = new PlaceHolder();
for (int i = 1; i <= Convert.ToInt16(DropDownList1.SelectedValue.ToString()); i++)
{
TextBox text = new TextBox();
text.ID = "textbox" + i;
plc1.Controls.Add(new LiteralControl("<table width='100%'><tr><td width='50%'>Full Name:</td><td>"));
plc1.Controls.Add(text);
plc1.Controls.Add(new LiteralControl("</td></tr></table>"));
}
PlaceHolder1.Controls.Add(plc1);
}

Hope this will help you.