how to close current webform after click messagebox ok butto

Question

how to close current webform after click messagebox ok butto


iam using liek this

 protected void btnUpdate_Click(object sender, EventArgs e)

        {

            ScriptManager.RegisterStartupScript(this, this.GetType(), "Messagebox", "alert('Record Updated successfully.Note: This tab is now getting close');", true);

            

        }


so how to close current webform after click messagebox ok button