C# asp.net error in Simulate.Mid(FileNameStr, SFilePosition);

I'm getting an error in the following line: Simulate.Mid(FileNameStr, SFilePosition);
of the code below: the error is: The name 'Simulate' does not exist in current context.

public string GetFileName(string FileNameStr, string GroupName)
            string FileStr = null;
            string DocFileStr = null;
            Int32 FilePosition = 0;
            Int32 SFilePosition = 0;
            var SrchStr = "\\";

            //Get the filename only fromt eh FileNameString
            FilePosition = (FileNameStr ?? string.Empty).IndexOf(SrchStr) + 1;
            while (FilePosition > 0)
                SFilePosition = FilePosition;
                FilePosition = (FileNameStr ?? string.Empty).IndexOf(SrchStr, FilePosition, System.StringComparison.OrdinalIgnoreCase) + 1;
            FileStr = Simulate.Mid(FileNameStr, SFilePosition);
            //Merge with the document path and groupname
            //Set the full path
            if (GroupName == null || GroupName.Length == 0)
                DocFileStr = FileStr; //DocFilePath & FileStr
                return DocFileStr;
                DocFileStr = GroupName + FileStr; //DocFilePath & GroupName & FileStr
                return DocFileStr;
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Russ SuterCommented:
You haven't declared Simulate anywhere in your code block. The compiler has no idea what it is.

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smares323Author Commented:
How do i declare the Mid

  public static partial class Simulate
Russ SuterCommented:
Are you creating a class called Simulate? What does Mid do? What does it return? What else does the Simulate class do?

There's a big gap of information.
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