".ASPX web form page who contains ReportViewer control"
"The action in the controller"
|
ASP.NET MVC and SQL Server Reporting Services
SSRS Report - Showing Header objects only on First Page
Adding a Page Break after a Sub-report (SSRS report)
WCF service under Network Load Balancing (NLB)
.NET Framework Version (including 4.0+)
DbEntityValidationException - Entity framework validation error handling
In my case the problem was incorrect Entity Key setting on my entity in EF Model plus forgetting to set primary key in DB table. After setting primary key for the table which entity pointing too, I needed to update the model and open the EF model and manualy set Entity Key for primary key related member in the entity and clearing Entity Key setting for unnecessary entity members. Then rebuild, it worked. The reason was EF created a compound key made of all non nullable entity members which I had to reset them all.
It was my case but there are other possibilities for this error which already discussed if you search on Internet (Google or bing it)Unable to update the EntitySet 'EntityName' because it has a DefiningQuery and no
SQL - Record count for all tables in a DB
How to add a digital ID to adobe reader (.pfx exported certificate file)
Microsoft Security Essentials - a must have security pieces to protect your system