Microsoft Reporting WebForms Version Conflict Error resolved..

Error message:
This example is taken with reference to report viewer version 10.0.0.0 and version 9.0.0.0

The type 'Microsoft.Reporting.WebForms.IReportServerCredentials' exists in both 'C:\Windows\assembly\GAC_MSIL\Microsoft.ReportViewer.WebForms\9.0.0.0__b03f5f7f11d50a3a\Microsoft.ReportViewer.WebForms.dll' and 'C:\Windows\assembly\GAC_MSIL\Microsoft.ReportViewer.WebForms\10.0.0.0__b03f5f7f11d50a3a\Microsoft.ReportViewer.WebForms.dll'   

Solution:

Step 1. Open the Solution Explorer and right click on the Solution and select Property Pages.
Step 2. click on references and choose the report viewer which is no required.
Step 3. Click on remove and then build the solution.
















 Error resolved...!!!

For any further information on crystal report you can visit
1. Microsoft MSDN
2. Wikipedia