Question

DataTable _dt = new DataTable();

using (SqlConnection _cs = new SqlConnection("Data Source=COMNAME; Initial Catalog=DATABASE; Integrated Security=True"))
{
    string _query = "SELECT * FROM Doctor";
    SqlCommand _cmd = new SqlCommand(_query, _cs);

    using (SqlDataAdapter _da = new SqlDataAdapter(_cmd))
    {
        _da.Fill(_dt);
    }
}
cbDoctor.DataSource = _dt;
foreach(DataRow _dr in _dt.Rows)
{
    cbDoctor.Items.Add(_dr["name"].ToString());
}

There was an Error…

The result is System.Data.DataRowView instead of data from database..

Answer 1

I’m not yet sure what is the exact error in your code, but if you’re ok with not using DataTable, you can do it this way:

using (SqlConnection sqlConnection = new SqlConnection("connstring"))
{
    SqlCommand sqlCmd = new SqlCommand("SELECT * FROM Doctor", sqlConnection);
    sqlConnection.Open();
    SqlDataReader sqlReader = sqlCmd.ExecuteReader();

    while (sqlReader.Read())
    {
        cbDoctor.Items.Add(sqlReader["name"].ToString());
    }

    sqlReader.Close();
}

For more information take a look at SqlDataReader reference on MSDN.

In orer to find the issue in the original code you posted, please provide information in which line you get the exception (or is it an error that prevents application from compiling?) and what is its whole message.