CSRF token validation failed - ODATA

Hi Expert,

When i am fetching data  throw ODATA it's working fine.

When i am pushing data throw Gateway Client ( /IWFND/GW_CLIENT) . it's also working fine.

Below is screen Shot of /IWFND/GW_CLIENT tcode.

Below is CSRF Token.

Below is Status after data pushing.

But when i am pushing data throw .NET application it's showing error "CSRF token validation failed"

Below screen shot of .NET  Error.

Below is C# (.NET) code for generating CSRF Token.

Method 1 .

Method 2.

above code is generating CSRF Token Successfully.

when pushing data throw .NET Application. it's throwing below error.

i am trying multiple scenario but it's not working properly. throwing error on " Client.SaveChanges()  " or " Client.UpdateObject() "

Please help.

Thankx

Prakash