private void btnAdd_Click(object sender, EventArgs e) { if (ValidField()) { MessageBox.Show("Please fill out all textbox!", "Infomation", MessageBoxButtons.OK, MessageBoxIcon.Information); return; } Class Class = new Class(txtClassID.Text, txtClassName.Text, cmbFacultyID.SelectedValue.ToString()); if (obj.Class_Insert(Class)) { MessageBox.Show("Insert Class successed!", "Infomation", MessageBoxButtons.OK, MessageBoxIcon.Information); BinData(); Clear(); } else { MessageBox.Show("Insert Class unsuccessed!", "Infomation", MessageBoxButtons.OK, MessageBoxIcon.Information); } }