"Value cannot be null.Parameter name: DeviceCredentials" Error while connection to crm from ASP.Net Application

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  Hi,

  I am getting the following error while connecting to crm online 2011 from ASP.Net Application

  "Value cannot be null.\r\nParameter name: DeviceCredentials".

  I am using the following code to bind the dropdown list with data from crm.

             

  private void BindDropDownList(IOrganizationService prmCrmService, string prmEntityName, string prmAttributeName, List<OptionCodes> ListOfOptions, DropDownList ddl)
          {
              RetrieveAttributeRequest retrieveAttributeRequest = new RetrieveAttributeRequest
              {
                  EntityLogicalName = prmEntityName,
                  LogicalName = prmAttributeName,
                  RetrieveAsIfPublished = true
              };
  
  RetrieveAttributeResponse retrieveAttributeResponse = (RetrieveAttributeResponse)prmCrmService.Execute(retrieveAttributeRequest);//This line gives error
  
              Microsoft.Xrm.Sdk.Metadata.PicklistAttributeMetadata retrievedPicklistAttributeMetadata = (Microsoft.Xrm.Sdk.Metadata.PicklistAttributeMetadata)
  
              retrieveAttributeResponse.AttributeMetadata;
  
              OptionMetadata[] jj_OptionList = retrievedPicklistAttributeMetadata.OptionSet.Options.ToArray();
              ListOfOptions = new List<OptionCodes>();
              foreach (OptionMetadata jj_OptionMetaData in jj_OptionList)
              {
                  OptionCodes objCRM_OptionCodes = new OptionCodes();
                  objCRM_OptionCodes.CRM_OptionCode = jj_OptionMetaData.Value.Value;
                  objCRM_OptionCodes.CRM_OptionCode_Text = jj_OptionMetaData.Label.UserLocalizedLabel.Label;
                  ListOfOptions.Add(objCRM_OptionCodes);
              }
              ddl.DataTextField = "CRM_OptionCode_Text";
              ddl.DataValueField = "CRM_OptionCode";
              ddl.DataSource = ListOfOptions;
              ddl.DataBind();
              ddl.Items.Insert(0, new ListItem("Select", "0"));
          }

  
  

  Any help would be appreciated.

  Wednesday, September 25, 2013 6:10 AM