protected void Button3_Click(object sender, EventArgs e) { try { Label19.Visible = false; ServiceReference1.Service1Client obj2 = new ServiceReference1.Service1Client(); bool result = obj2.usernameValidate(TextBox3.Text); if (result == true) Label19.Text = "Valid"; else Label19.Text = "Invalid"; Label19.Visible = true; } catch { Label19.Visible = true; Label19.Text = "Invalid"; } }