How to make the last two numbers typed into a asp:textbox decimals?

Hello Experts,

I have an asp:textbox with the following regular expression validator:

<asp:RegularExpressionValidator ID="rev_case_exp_cost_txt" runat="server" ControlToValidate="case_exp_cost_txt" Type="Integer" Operator="DataTypeCheck" ErrorMessage="Invalid Format" ValidationExpression="^\d{1,11}(?:\.\d\d)?$"></asp:RegularExpressionValidator>

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How can I get it to automatically make the last two numbers entered as the decimals?  For example, if the user types 300, it should show 3.00 after they tab out of the field - or 50000 would be 500.00.  

I am using and c#.

Any help would be greatly appreciated.

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Kyle AbrahamsSenior .Net DeveloperCommented:
Majority of the script taken from here:

Splice function found online found online

add this to your textbox:


<script type="text/javascript">
function checkDecimal(obj, objStr){
    var objNumber;
    if(isNaN(objStr) && objStr!=''){
        alert('Value entered is not numeric');
        objNumber = '0.00';
    else if(objStr==''){
        objNumber = '0.00';
    else if(objStr.indexOf('.')!=-1){
        if(((objStr.length) - (objStr.indexOf('.')))>3){
            objStr = objStr.substr(0,((objStr.indexOf('.'))+3));
            objStr = '0' + objStr;
        var sLen = objStr.length;
        var TChar = objStr.substr(sLen-3,3);
            objNumber = objStr;
        else if(TChar.indexOf('.')==1){
            objNumber = objStr + '0';
        else if(TChar.indexOf('.')==2){
            objNumber = objStr + '00';
        objNumber = objStr.splice(len(objstr)-2,0,'.');
    obj.value = objNumber;

String.prototype.splice = function( idx, rem, s ) {
    return (this.slice(0,idx) + s + this.slice(idx + Math.abs(rem)));

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Manoj PatilSr. Software EngineerCommented:
Hi you can try JQuery for this.
Check this link
And Sample Code for this is attached below.



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ferguson_jeraldAuthor Commented:
I tested both suggestions and they both worked!  Thanks for the help.
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