使用来自SQL Server的数据填充ComboBox

Question

I want to fill a ComboBox with data from sql server and I use the code below, but it doesn't work:

protected void FillComboBox()
{
    SqlDataAdapter da = new SqlDataAdapter("SELECT ItemName FROM TBItemList", oSqlConn);
    DataTable dt = new DataTable();
    da.Fill(dt);
    {
         cbxparameter.Items.Add(dt.ToString());
    }
}

Then to make sure my code is okay I'm trying to debug, but I can't know where the trouble lies. Why?

Answer 1

SqlDataAdapter da = new SqlDataAdapter("SELECT ItemName FROM TBItemList", oSqlConn);
DataTable dt = new DataTable();
da.Fill(dt);
cbxparameter.DataSource = dt;
cbxparameter.DisplayMember = "ItemName";
cbxparameter.ValueMember = "ItemName";

Answer 2

SqlCommand sqlCmd = new SqlCommand(sql, sqlCon);
                sqlCmd.CommandTimeout = 0;
                SqlDataReader dr;
                dr = sqlCmd.ExecuteReader();
                MyDDLst.Items.Insert(0, "--Select--");
                while (dr.Read())
                    MyDDLst.Items.Add(dr[0].ToString());