private bool ValidateInput()
 {
     if (TxtLoginId.Text == "")
     {
         MessageBox.Show("请输入用户名", "输入提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
         TxtLoginId.Focus();
         return(false);
     }
     if (TxtLoginPwdAgain.Text == "")
     {
         MessageBox.Show("请输入密码", "输入提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
         TxtLoginPwdAgain.Focus();
         return(false);
     }
     if (TxtLoginPwdAgain.Text == "")
     {
         MessageBox.Show("请输入密码", "输入提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
         TxtLoginPwdAgain.Focus();
         return(false);
     }
     if (!(TxtLoginPwd.Text == TxtLoginPwdAgain.Text))
     {
         MessageBox.Show("两次输入密码不一致", "输入提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
         TxtLoginPwdAgain.Focus();
         return(false);
     }
     if (!RadioActive.Checked && !RadioInActive.Checked)
     {
         MessageBox.Show("请设置用户状态", "输入提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
         RadioActive.Focus();
         return(false);
     }
     if (TxtStudentName.Text == "")
     {
         MessageBox.Show("请输入学员姓名", "输入提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
         TxtStudentName.Focus();
         return(false);
     }
     if (TxtId.Text == "")
     {
         MessageBox.Show("请输入学员学号", "输入提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
         TxtId.Focus();
         return(false);
     }
     if (!RadioMale.Checked && !RadioFemale.Checked)
     {
         MessageBox.Show("请选择学员性别", "输入提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
         RadioMale.Focus();
         return(false);
     }
     if (CboClass.Text == "")
     {
         MessageBox.Show("请选择学员班级", "输入提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
         CboClass.Focus();
         return(false);
     }
     return(true);
 }
 /// <summary>
 /// 查询方法
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="e"></param>
 private void BtnSelect_Click(object sender, EventArgs e)
 {
     if (TxtLoginId.Text == "")
     {
         MessageBox.Show("请输入用户名", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
         TxtLoginId.Focus();
     }
     else
     {
         FillListView();
     }
 }