Creating rdlc reports in Sharepoint using visual studio 2013

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SharePoint2013

hi,im new to Sharepoint 2013.I am trying to create an rdlc report using the report viewer.my issues are the following:

1. As soon as i place the report viewer control it throws an error :"report viewer failed to modify the web config.reports may not display correctly.Configuration file not found.Parameter webConfigpath". but on clicking ok im able to work further.I dont know if this is an issue.im able to view my webpart.

2. Im not able to view my report.there are no errors in code,but after execution it shows a msg : "A data source instance has not been supplied for the data source 'Dataset1'".

this is the code given for binding code to report:

//ReportData is a userdefined function

DataTable reportdt=ReportData();          
ReportDataSource dsrpt = new ReportDataSource();
dsrpt.Name = "Datasetpagename_NameofdatatableinDatasetpagename";
dsrpt.Value = reportdt;

string s1;
s1 = reportdt.Rows[0]["C1"].ToString();
//   s2 = dt.Rows[0]["C2"].ToString();

try
{
   if (dsrpt != null)
   {
      ReportViewer1.LocalReport.ReportPath = Server.MapPath("~/_LAYOUTS/15/SampleReport/SampleReport1.rdlc");
      ReportViewer1.LocalReport.EnableExternalImages = true;

      ReportViewer1.Visible = true;
      ReportViewer1.LocalReport.ExecuteReportInCurrentAppDomain(System.Reflection.Assembly.GetExecutingAssembly().Evidence);

      ReportViewer1.LocalReport.DataSources.Clear();
      ReportViewer1.LocalReport.DataSources.Add(new ReportDataSource("SampleReportDataSet", reportdt));

      Microsoft.Reporting.WebForms.ReportParameter[] reportParameterCollection = new Microsoft.Reporting.WebForms.ReportParameter[1];

      reportParameterCollection[0] = new Microsoft.Reporting.WebForms.ReportParameter();
      reportParameterCollection[0].Name = "ProjectName";
      reportParameterCollection[0].Values.Add(s1 == null ? "" : s1);
      reportParameterCollection[0].Visible = false;

      ReportViewer1.AsyncRendering = false;
      ReportViewer1.SizeToReportContent = true;

      ReportViewer1.LocalReport.Refresh();
   }
}

Please help me..its very urgent..