Sequence contains no matching element - EntityFramework

Question

I\'m using EF 6.1.0 and was creating a WCF Service.

First I created a Class Library containing my entities, Mappers and Context for initializing EF. I\'ve also creat

Answer 1

I was also getting same error while adding migration or updating database.

The reason was I was using wrong column type

[Column("ImageType", TypeName = "varchar(20)")]
public string ImageType
{
     get;
     set;
}

But when I removed 20 from varchar it started working for me

[Column("ImageType", TypeName = "varchar")]
public string ImageType
{
    get;
    set;
}