Reverse logic for string

If we pass the ref type of string as a parameter.
It will the method reverseString will reverse your string
The below code is used to reverse your string

public void reverseString(ref string MyString) { 
    string tempStr = ""; 
    int i, j; 
 
    Console.WriteLine("Reversing your string"); 
    for(j=0, i=MyString.Length-1; i >= 0; i--, j++) 
      tempStr += MyString[i]; 
 
    MyString = tempStr; 
  }