The “X” property on “Y” could not be set to a 'null' value. You must set this property to a non-null value of type 'Int32'

Question

When I run my application and I click a specific button I get the error:

\"The \"X\" property on \"Y\" could not be set to a \'null\' value. You must set thi         


        

Answer 1

to fix the error

 Error 3031: Problem in mapping fragments starting at line 4049:Non-nullable column "X" in table "Y" is mapped to a nullable entity property.

open your EDMX file with and xml editor and lookup you table in

edmx:StorageModels

find the propertie which gives the error and set or add

Nullable="false" >> to Nullable="true"

save the edmx, open it in visual studio and build it. problem solved