Binding dynamic dataset to RDLC Report in ASP.Net

i have crated a dynamic SP  & the results of which i need to bind to rdlc report

usig wizard i tried to create a dataset for binding to rdlc but in that though dataset is created it does not have the field names

how do i create a dataset from code behind & bind to rdlc

the cod ethat i have is

public DataTable GetData()
        {
SqlCommand cmd = new SqlCommand("usp_report", con); 
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.AddWithValue("@pYear", drpyrsal.SelectedValue);
            cmd.Parameters.AddWithValue("@pMonth", drpmonth.SelectedValue);
        
         
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataSet ds = new DataSet();
            da.Fill(ds); 
        
            return ds.Tables[0];
        }



ReportViewer1.LocalReport.ReportPath = Server.MapPath("reports/PR.rdlc");
            //ReportDataSource rdS = new ReportDataSource("X_PR_DataTable1", GetData());
            ReportDataSource rdS = new ReportDataSource("ds", GetData());
            ReportViewer1.LocalReport.DataSources.Clear();
            ReportViewer1.LocalReport.DataSources.Add(rdS);