ASP .NET: Assigning Data to DataSet table

WebConfig

connectionStrings
add name="HRDWConnString" connectionString="Data Source=.;Initial Catalog='HR DW';Integrated Security=True" providerName="System.Data.SqlClient"/
/connectionStrings

Code

//Connect to DB
string connStr = ConfigurationManager.ConnectionStrings["YOURDBCONNECTION IN WEB CONFIG"].ConnectionString;
SqlConnection conn = new SqlConnection(connStr);
SqlCommand comm = conn.CreateCommand();
comm.CommandText = @"SELECT
--[DisplayName]
[FileName]
,[ParameterName]
,[DefaultValue]
FROM [dbo].[vwLookupReportParameterDefaults]";
try
{
conn.Open();
SqlDataAdapter ad = new SqlDataAdapter(comm.CommandText.ToString(),conn);
ad.Fill(dataset, "Parameters");
Cache["dataset"] = ds;

//SqlDataReader dr = comm.ExecuteReader();
//while (dr.Read())
//{
//ReportParameters = new ListItem(dr[2].ToString(), dr[3].ToString());
//}
}
catch (Exception ex)
{
Response.Redirect("LoginError.aspx");
}
finally
{
conn.Dispose();
}

DataSet d = new DataSet();
d = (DataSet)Convert.ChangeType(Cache["dataset"], typeof(DataSet));
dt = d.Tables[0];
for (int i =0; i < dt.Rows.Count; i++) {
if (report == dt.Rows[i]["FileName"].ToString())
{
ReportParameter param = new ReportParameter(dt.Rows[i]["ParameterName"].ToString(), dt.Rows[i]["DefaultValue"].ToString());
ReportViewer1.ServerReport.SetParameters(new ReportParameter[] { param });
}
}