How to do this in C#?

Question

//VC++ : PackData(CString strInput) { CString strReturned; char nLength = strInput.GetLength() + 2; char b= 0x03; char zero = 0x00; strReturned.Format("%c%c", nLength, b); strReturned += strInput; for(int i = 0;i<(32 - nLength); i++) strReturned += zero; return strReturned; } what does the identical c# code look like? Thanks!