protected void TextBox4_TextChanged(object sender, EventArgs e) { bl.item_name = TextBox4.Text; DataSet ds = new DataSet(); ds = dl.secectitmnam(bl); if (ds.Tables[0].Rows.Count > 0) { ScriptManager.RegisterStartupScript(this, this.GetType(), "redirect", "alert('The Item Name Already Exists'); window.location='item_msater.aspx';", true); } dwd_grp.Focus(); }