public void ShowDifferenceBetweenTwoFile()
{
diff_match_patch DIFF = new diff_match_patch();
List<Chunk> chunklist1;
List<Chunk> chunklist2;
diffs = DIFF.diff_main(richTextBoxCurrentVersion.Text, richTextBoxLastVersion.Text);
DIFF.diff_cleanupEfficiency(diffs);
chunklist1 = collectChunks(richTextBoxCurrentVersion);
chunklist2 = collectChunks(richTextBoxLastVersion);
paintChunks(richTextBoxCurrentVersion, chunklist1);
paintChunks(richTextBoxLastVersion, chunklist2);
richTextBoxCurrentVersion.SelectionLength = 0;
richTextBoxLastVersion.SelectionLength = 0;
}