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Example code of how to easily calculate the SHA256 checksum of a file in CSharp:

string checksum = "";
string path = "C:/file.txt";

using (System.IO.FileStream stream = System.IO.File.OpenRead(path))
{
    System.Security.Cryptography.SHA256Managed sha = new System.Security.Cryptography.SHA256Managed();
    byte[] bytes = sha.ComputeHash(stream);
    checksum = BitConverter.ToString(bytes).Replace("-", String.Empty);
}

This class is supported in all regular .NET framework versions according to MSDN.