protected void Button2_Click(object sender, EventArgs e) { dml ob = new dml(); DataTable dt = new DataTable(); dt = ob.check1(TextBox4.Text); if (dt.Rows.Count > 0) { ClientScript.RegisterStartupScript(GetType(), "alert", "alert('UserName Alredy Exist!');", true); TextBox3.Text = ""; TextBox4.Text = ""; TextBox5.Text = ""; TextBox6.Text = ""; } else { string userid = ob.inc2(); ob.user_details(userid, TextBox6.Text, TextBox5.Text, TextBox4.Text, TextBox3.Text); TextBox3.Text = ""; TextBox4.Text = ""; TextBox5.Text = ""; TextBox6.Text = ""; } }