Calling The SP From ASP.NET Application

Hi All,
 
I have problem in calling the SP from ASP.NET application 
 @DefApp nvarchar(255)= '' ,@DefBusFunction nvarchar(255)= '' ,@DefImpact nvarchar(255) = '',AS Begin declare @sql nvarchar(4000)declare @whereClause nvarchar(4000)DECLARE     @return_value intdeclare @sqlWhere nvarchar(4000) select @sql = 'SELECT DefApp, DefBusFunction, DefImpact FROM Def LEFT JOIN ZFunction ON (def.DefApp = ZFunction.App) AND (Def.DefBusFunction = ZFunction.BusFunction)' if @DefImpact <> ''      Set @whereClause = ' where DefImpact '      SET @whereClause = @whereClause + ' = ''' + @DefImpact + '''' set @sqlWhere=@sql + @WhereClauseEXEC @sqlWhereEnd 
and i am calling this SP from my ASP.net application to fill the SSRS report. I have written code in ASP.NET like:

 sqlCmd = new SqlCommand("subbusample", conn);

sqlCmd.CommandType = CommandType.StoredProcedure;sqlCmd.Parameters.Add(new SqlParameter("@DefImpact", SqlDbType.NVarChar, 255, txtValue3.Text.ToString()));

sqlCmd.Parameters.Add(new SqlParameter("@DefBusFunction", SqlDbType.NVarChar, 255, txtValue1.Text.ToString()));

sqlCmd.Parameters.Add(new SqlParameter("@DefApp", SqlDbType.NVarChar, 255, txtValue2.Text.ToString()));

 RptViewer.ProcessingMode = Microsoft.Reporting.WebForms.ProcessingMode.Remote;

RptViewer.ServerReport.ReportServerUrl = new System.Uri("http://servername/ReportServer");RptViewer.ShowParameterPrompts = false;

RptViewer.ServerReport.ReportPath = "/folder name/Subbu_Sample";
 
when i execute it, i am not able to fill the report with data.
 
Please let me know what i am doing wrong.
 
Thanks,
SR.