public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { dt = new DataTable(); DataColumn dc1 = new DataColumn("NAME"); DataColumn dc2 = new DataColumn("ADDRESS"); dt.Columns.Add(dc1); dt.Columns.Add(dc2); DataRow dr1 = dt.NewRow(); GridView1.DataSource = dt; GridView1.DataBind(); } DataTable dt; protected void Button1_Click(object sender, EventArgs e) { DataRow dr1 = dt.NewRow(); dr1[0] = TextBox1.Text; dr1[1] = TextBox2.Text; dt.Rows.Add(dr1); GridView1.DataSource = dt; GridView1.DataBind(); } }