Provided by: http://www.aspdotnetcodes.com/ReadTips_Convert_SqlDataReader_To_DataTable_DataSet.aspx

To convert a SqlDataReader to DataTable or DataSet, use DataTable's Load method. Just look at the sample block of statements below.

string sql = "Select * from MyTable";
SqlCommand cmd = new SqlCommand(sql, MyConnection);
SqlDataReader dr = cmd.ExecuteReader();
DataTable dt = new DataTable();

//Load the SqlDataReader object to the DataTable object as follows.
dt.Load(dr);

Response.Write(dt.Rows.Count.ToString());