Resize / Scale and image proportionately

public Size ScaleImage( Size imgToResize, Size size )
{

int sourceWidth = imgToResize.Width;
int sourceHeight = imgToResize.Height;

int oldWIdth = size.Width;
int oldHeight = size.Height;

float nPercent = 0;
float nPercentW = 0;
float nPercentH = 0;

nPercentW = ( ( float )oldWIdth / ( float )sourceWidth );
nPercentH = ( ( float )oldHeight / ( float )sourceHeight );

if ( oldWIdth > oldHeight )
nPercent = nPercentW;
else
nPercent = nPercentH;

int destWidth = ( int )( oldWIdth / nPercent );
int destHeight = ( int )( oldHeight / nPercent );


return new Size( destWidth, destHeight );


}