Question

Adding the row one by one in the button click..
(i tried but its overwirting the same row)

Answer 1

Here it is in vb for you. Tested it, seems to work fine. Declare dt as shared

Imports System.Data

Partial Class _Default
    Inherits System.Web.UI.Page

 Shared dt As DataTable


    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        If Not IsPostBack Then
            dt = New DataTable
            dt.Columns.Add("Colum1")
            dt.Columns.Add("Colum2")

        End If

    End Sub
    Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        dt.Rows.Add(TextBox1.Text, TextBox2.Text)
        GridView1.DataSource = dt
        GridView1.DataBind()

    End Sub
End Class