CheckSum SQL to LINQ conversion

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C++

SQL-Server

LINQ

Hi,
I want to convert checksum(getdate()) to Linq. I was tried the below code. But this code return an exception "This function can only be invoked from LINQ to Entities".

using System.Data.Objects.SqlClient;
decimal? checkSum = SqlFunctions.Checksum(DateTime.Now);

Please help me to solve this issue.