Question

My code throws the error

Invalid attempt to call Read when reader is closed.

I’m using SqlDataReader to read values from database, and that is my code:

while (rd.Read())
{
    string stateincharge = rd["stateincharge"].ToString();
    string email = rd["email"].ToString();
    cmd.Dispose();
    rd.Close();
    cmd = con.CreateCommand();
    cmd.CommandText = "str_procedure";
    cmd.Parameters.AddWithValue("@stateincharge", stateincharge);
    cmd.CommandType = CommandType.StoredProcedure;
    ad.SelectCommand = cmd;
    ad.Fill(ds);
    count = ds.Tables[0].Rows.Count;
    DataTable dt = new DataTable();
}

This runs in a loop in ASP.NET code-behind.

My problem is that I think I need to close SqlDatReader because of an error shown.

How can I again open sqlDataReader at end of the while loop?

Answer 1

You have to remove the line that closes the reader rd.Close(); because you are closing the reader inside the while loop then you try to access the reader again. Also, I think if you used a new SQL command and new adapter you will not receive this error.