如果用户输入的注册号存在于数据库中，我正在尝试显示一个网格，如果注册号不存在，这意味着我还需要显示一个标签。我是 asp.net 中的一个新标签，所以请帮助我。下面是我的代码。
public DataTable madhrasaViewByRegNo(string viewByNo)
{
try
{
madhrasaInfo infomadhrasa = new madhrasaInfo();
object decobj = new object();
if (sqlcon.State == ConnectionState.Closed)
{
sqlcon.Open();
}
SqlCommand sqlcmd = new SqlCommand("madhrasaViewByRegNo", sqlcon);
sqlcmd.CommandType = CommandType.StoredProcedure;
sqlcmd.Parameters.Add("@regNo", SqlDbType.VarChar).Value = viewByNo;
decobj = sqlcmd.ExecuteNonQuery();
if (decobj == null)
{
decStuId = decimal.Parse(decobj.ToString());
}
else
{
DataTable dtbClass = new DataTable();
SqlDataAdapter sqlda = new SqlDataAdapter("madhrasaViewByRegNo", sqlcon);
sqlda.SelectCommand.CommandType = CommandType.StoredProcedure;
sqlda.SelectCommand.Parameters.Add("@regNo", SqlDbType.VarChar).Value = viewByNo;
sqlda.Fill(dtbClass);
return dtbClass;
}
}
catch (Exception)
{
throw;
}
return null;
}
public void gridfillByNo()
{
madhrasaSp spMadhrasa = new madhrasaSp();
DataTable dtbl = new DataTable();
dtbl = spMadhrasa.madhrasaViewByRegNo(TextBox2.Text);
gvstuResult.DataSource = dtbl;
gvstuResult.DataBind();
}
public void regSearch()
{
madhrasaSp spmadhrasa = new madhrasaSp();
spmadhrasa.madhrasaViewByRegNo(TextBox2.Text);
if (madhrasaSp.decStuId > 0)
{
gridfillByNo();
MultiView1.ActiveViewIndex = 1;
}
else
{
MultiView1.ActiveViewIndex = 0;
Label1.Visible = true;
Label1.Text = "Invalid Register Number";
}
}
protected void Button2_Click(object sender, EventArgs e)
{
regSearch();
}