Efficiency Testing for replacement (MS vs my)

Because the company wants to provide data to other companies, there are characters to replace in the data. There are two replacement methods
 
Code1:

Public   Static   Void Main ()
{

StringInput1= "";

Stringbuilder SB1 =   New Stringbuilder ();
For ( Int I = 0 ; I <   50000 ; I ++ )
{
Sb1.append ( " Wo \ r " );
}

Input1 = Sb1.tostring ();

WL ( " SB test date is complate .. " );

Stopwatch SW1 =   New Stopwatch ();


// Char
Sw1.start ();
Stringbuilder sb =   New Stringbuilder ();
If (Input1 ! = String. Empty)
{
For ( Int I =   0 ; I < Input1.length; I ++ )
{
Switch (Input1 [I])
{
Case ( Char ) 13 :
SB. append ( "   " );
Break ;
Case ( Char ) 10 :
SB. append ( "   " );
Break ;
Default :
SB. append (input1 [I]);
Break ;
}
}
Input1 = SB. tostring ();
}
Sw1.stop ();


WL (sw1.elapsedmilliseconds +   " Millisecond " );


RL ();
}

Code 2:

Public   Static   Void Main ()
{

String Input1 =   "" ;

Stringbuilder SB1 =   New Stringbuilder ();
For ( Int I = 0 ; I <   50000 ; I ++ )
{
Sb1.append ( " Wo \ r " );
}

Input1 = Sb1.tostring ();

WL ( " Replace test date is complate .. " );

Stopwatch SW1 =   New Stopwatch ();


// Char
Sw1.start ();
Input1 = Input1.replace ( " \ R " , "   " );
Input1 = Input1.replace ( " \ N " , "   " );
Sw1.stop ();


WL (sw1.elapsedmilliseconds +   " Millisecond " );


RL ();
}

Figure1: 6 s
Figure2: 3 S