private void btnAdd_Click(object sender, EventArgs e) { string name = txtName.Text; if (name != "") { try { CC.AddUser(name); dataUsers.DataSource = CC.GetAllUsers(); txtName.Text = string.Empty; } catch (Exception) { MessageBox.Show("Connection error"); } } else { MessageBox.Show("Write a Sales Rep name to add it"); } btnAdd.Enabled = false; }