I want to retrieve and save the data from dynamically created controls from code behind. and dynamic controls are generated through dropdown selection

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ASP.NET

<asp:HiddenField ID="hdnCount" Value="1" runat="server" />

VB

Dim rowCount As Integer = Integer.Parse(hdnCount.Value)
       

      For rowNumber As Integer = 1 To rowCount 

            Dim name As TextBox = DirectCast(tblMain.Rows(rowNumber).Cells(0).FindControl("txtName" & rowNumber.ToString()), TextBox)
            
            Dim age As DropDownList = DirectCast(tblMain.Rows(rowNumber).Cells(0).FindControl("drdAge" & rowNumber.ToString()), DropDownList)
            Dim sex As DropDownList = DirectCast(tblMain.Rows(rowNumber).Cells(0).FindControl("drdSex" & rowNumber.ToString()), DropDownList)
            Dim mobileno As TextBox = DirectCast(tblMain.Rows(rowNumber).Cells(0).FindControl("txtmobileno" & rowNumber.ToString()), TextBox)
           
            lblDisplay.Text = name
           lblDisplay1.Text = age
lblDisplay2.Text = sex
lblDisplay3.Text = mobileno

        Next

the error for this code is "Object Reference is not set to an instance of an object"
here textbox does not retrieve the ID and gives the null value (nothing).

Please help for this query. Its ~~very Urgent~~...!
Thank you in advance...!

Posted 17-May-13 3:57am

Member 9996543

Updated 19-May-13 19:45pm

Abhishek Pant

v2

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Member 9996543 · Accepted Answer · 2013-05-19T19:40:00

Solution 3

Thanks a lot....! Mahesh :-)
this solution was helpful...!

Posted 19-May-13 19:40pm

Member 9996543

Pallavi Waikar · Accepted Answer · 2013-05-17T04:10:00

Solution 1

I think u forgot to use text property of textbox
example
name is textbox then at time of assigning value to lblDisplay u have to use

lblDisplay.Text = name.Text

Posted 17-May-13 4:10am

Pallavi Waikar

Mahesh Bailwal · Accepted Answer · 2013-05-17T04:23:00

I have faced the same problem long ago. Below is the approach I have used best to my knowledge

First you need to recreate your dynamic control on PostBack as they no longer exist.

Then to get value submitted by user you need to use following syntax

VB

Dim name As TextBox = DirectCast(tblMain.Rows(rowNumber).Cells(0).FindControl("txtName" & rowNumber.ToString()), TextBox)

name.Text = Request(name.UniqueID)

Hope this help and also let me know if you need some clarification