Move Cursor to the Last Index in The Texbox

Code for script section in the head

<script type="text/javascript" language="javascript">
function moveindex() {
var me2 = document.selection.createRange();
me2.moveStart("character", 200);
me2.select();
}
</script>

code for calling the function in the body section

<asp:TextBox ID="TextBox1" runat="server" onfocus="moveindex()"/>

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Thanks and Regards
Meetu Choudhary