assign List object to a dataset in crystal reports

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C#

I want to pass my list object to a data set and then view data in crystal report.I have written following code but its not seems to be working, data is not appearing in the report. and it says "The report you requested requires further information."

pls help me to solve this issue , thanx


protected void ButtonView_Click(object sender, EventArgs e)
{
SongsExtraBD sngexbd = new SongsExtraBD();
List<tblsongs> objSongList = new List<tblsongs>();
objSongList = sngexbd.GetDownLoadList();

dsTest mydsTest = new dsTest();
DataTable objDataTable = new DataTable("tblSongs");

objDataTable.Columns.Add("SongID");
objDataTable.Columns.Add("Name");
objDataTable.Columns.Add("Rate");
objDataTable.Columns.Add("Language");

DataRow myDataRow;
foreach (tblSong tblsng in objSongList)
{

myDataRow = objDataTable.NewRow();
myDataRow[0] = tblsng.SongID;
myDataRow[1] = tblsng.Name;
myDataRow[2] = tblsng.tblrates.Rate;
myDataRow[3] = tblsng.Language;

objDataTable.Rows.Add(myDataRow);

}

mydsTest.Tables.Add(objDataTable);
rptDownLoad report = new rptDownLoad();
report.SetDataSource(mydsTest);
crptViewer.ReportSource = report;


}