asp.net - Report Viewer: Set null value to Report Parameters having allow null true -

i have report viewer control in web page responsible show reports.

i want parameters of report , check if parameter has allow null property true want pass parameter value null.

for have tried below code getting allowblank property false parameters:

reportparameterinfocollection defaultparams;     list<reportparameter> reportparams = new list<reportparameter>();     defaultparams = reportviewer1.serverreport.getparameters();      if (defaultparams.count > 0)     {          foreach (reportparameterinfo rp in defaultparams)          {              if (rp.allowblank)              {                  string str = null;                  reportparams.add(new reportparameter(rp.name, str));              }          }     } 

please me

i have resolved problem.

instead of checking allowblank property have checked nullable property.

allowblank property string parameters allows blank if want check if parameter allows null value have check nullable property

new code follows:

reportparameterinfocollection defaultparams; list<reportparameter> reportparams = new list<reportparameter>(); defaultparams = reportviewer1.serverreport.getparameters();  if (defaultparams.count > 0) {      foreach (reportparameterinfo rp in defaultparams)      {          if (rp.nullable)          {              string str = null;              reportparams.add(new reportparameter(rp.name, str));          }      } }