when ever we created a new entity and Generating account id but its not working why?

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  public void Execute(IServiceProvider serviceProvider)
          {
             IPluginExecutionContext  context = (IPluginExecutionContext )serviceProvider .GetService (typeof (IPluginExecutionContext ));
              if (context .InputParameters .Contains ("Target") && context .InputParameters ["Target"] is Entity )
              {
                 Entity entity = (Entity )context .InputParameters["Target"];
  
                  if(entity.LogicalName =="account")
                  {
                      if (entity.Attributes .Contains ("accountnumber") == false )
                      {
                          Random rndgen = new Random ();
                         entity .Attributes .Add ("accountnumber",rndgen .Next ().ToString ());
                      }
                      else
                      {
                        throw new InvalidPluginExecutionException ("the account number only set by the system.");
                      }
                  }
              }
  
          }
  
  
          }
      }

  In this Code their  and registration also succedded

  but in crm form it can't working why ? 

                  thank u

                               Naveen

  Monday, September 30, 2013 12:12 PM