Need expertise help when using RichTextBox's "TextChanged" event!

Hi every one, I'm trying to design my own language and it's compiler, I stored the language keywords in a .xml file, use a RichTextBox as an editor in order to make the code "color coded"! the problem is when use RichTextBox's "TextChanged" event, try this code: **************************code************************************* private void richTextBox1_TextChanged(object sender, System.EventArgs e) { DataSet ds = new DataSet(); ds.ReadXmlSchema(@"..\..\schema.xsd"); ds.ReadXml(@"..\..\KeyWords.xml"); int start = 0; System.Text.StringBuilder stBuild = new System.Text.StringBuilder(); for(int i = 0; i < richTextBox1.Text.Length; i++) { if(richTextBox1.Text[i] != ' ') { stBuild.Append(richTextBox1.Text[i]); DataRow[] drs = ds.Tables["elements"].Select("keyword = '" + stBuild.ToString() +"'"); if((drs.Length >0) && ((i == richTextBox1.Text.Length -1) || (richTextBox1.Text[i+1] == ' '))) { richTextBox1.Select(start, stBuild.Length); richTextBox1.SelectionColor = Color.Blue; /*----here, what should I do to return the cursor in the end of the selected word--------*/ } } else { stBuild.Remove(0,stBuild.Length); start = i+1; } } } ******************************************************************* what should I do to return the cursor in the end of the selected word?! I need expertise help.. Thanks in advance Manal..