Is there any other method that is faster than doing like this?

private void EscapeStringSequence(ref string data)
{
    data = data.Replace("\\", "\\\\"); // Backslash
    data = data.Replace("\r", "\\r");  // Carriage return
    data = data.Replace("\n", "\\n");  // New Line
    data = data.Replace("\a", "\\a");  // Vertical tab
    data = data.Replace("\b", "\\b");  // Backspace
    data = data.Replace("\f", "\\f");  // Formfeed
    data = data.Replace("\t", "\\t");  // Horizontal tab
    data = data.Replace("\v", "\\v");  // Vertical tab
    data = data.Replace("\"", "\\\""); // Double quotation mark
    data = data.Replace("'", "\\'");   // Single quotation mark
}

-- Edited (Add explanation) --
Q1: Is there a reason why you need to speed it up? Is it causing a huge problem?
This part is used in this project: http://mysqlbackuprestore.codeplex.com/
I'm going to loop lots of various length of strings into this function repeatly. The whole process takes around 6-15 seconds to finished for millions of rows. There are other part get involve too. I'm trying to speed up every part.

Q2: How slow is it now?
OK, I'll capture the exact time used and post it here. I'll come back later. (will post the result tomorrow)

Update 29-06-2012
I have run test. This is the result:

Speed Test: String.Replace() - measured in miliseconds
Test 1: 26749.7531 ms
Test 2: 27063.438 ms
Test 3: 27753.8884 ms
Average: 27189.0265 ms
Speed: 100%

Speed Test: Foreach Char and Append - measured in miliseconds

c# performance
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