DateDiff Method replacement in C# from VB

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C#

VB

Hello all

I need to have a replacement of DateDiff method in C#..... I have translate some vb code into C# and have an error in DateDiff...

Below is my VB Code

If rs("test_date") > Now() Then
                       sb.Append(DateDiff("d", Now(), rs("test_date")) & " days away")
                   Else

Below is C# code

if (Convert.ToDateTime(rs["test_date"]) > DateTime.Now)
               {
                   sb.Append(DateDiff("d", DateTime.Now, rs["test_date"]) + " days away");
               }

Error:
sb.Append(DateDiff("d", DateTime.Now, rs["test_date"]) + " days away");
error name: The name 'DateDiff' does not exists in current context.

You all are requested to let me have a replacement of this...

Thanks