Does anyone know the C# code to write validation on a textbox contained in a web application not windows without using ASP.NET controls (for e.g. regular validators or compare validators) just plain C# to accept only integers or decimals?

I see many posts on window applications, but none on web.  This is probably perhaps because of the built in controls of ASP.NET has already, but I just want to code it.  I'm trying to incorporate this textbox into a SharePoint application, which is why I'm asking.  I do not have access to the ASP.NET toolbox.  Therefore, I have no choice but to code it.

 Any help would be great.

Hi,

For my advice, you can use regular expressions to control it.

Below are some references for you:-

http://geekswithblogs.net/rahul/articles/49097.aspx

http://www.thescarms.com/dotnet/IsNumeric.aspx

http://www.codeproject.com/KB/books/0735616485.aspx

Hi,

Check these previous threads below:

http://forums.asp.net/p/1323787/2645052.aspx#2645052

http://forums.asp.net/p/299157/299157.aspx#299157

http://forums.asp.net/p/1203550/2100896.aspx#2100896

http://forums.asp.net/p/1106036/1692258.aspx#1692258

try this code hope its usefull for u 

<script type ="text/javascript">
function blockNonNumbers(obj, e, allowDecimal, allowNegative)
{
 var key;
 var isCtrl = false;
 var keychar;
 var reg;
 if(window.event)
 {
   key = e.keyCode;
   isCtrl = window.event.ctrlKey
 }
 else if(e.which)
 {
   key = e.which;
   isCtrl = e.ctrlKey;
 }
 if (isNaN(key)) return true;
 keychar = String.fromCharCode(key);
 // check for backspace or delete, or if Ctrl was pressed
 if (key == 8 || isCtrl)
 {
   return true;
 }
 reg = /\d/;
 var isFirstN = allowNegative ? keychar == '-' && obj.value.indexOf('-') == -1 : false;
 var isFirstD = allowDecimal ? keychar == '.' && obj.value.indexOf('.') == -1 : false;
 return isFirstN || isFirstD || reg.test(keychar);

}

function extractNumber(obj, decimalPlaces, allowNegative)
{
  var temp = obj.value;
  // avoid changing things if already formatted correctly
  var reg0Str = '[0-9]*';
  if (decimalPlaces > 0)
  {
    reg0Str += '\\.?[0-9]{0,' + decimalPlaces + '}';
  }
  else if (decimalPlaces < 0)
  {
     reg0Str += '\\.?[0-9]*';
  }
  reg0Str = allowNegative ? '^-?' + reg0Str : '^' + reg0Str;
  reg0Str = reg0Str + '$';
  var reg0 = new RegExp(reg0Str);
  if (reg0.test(temp)) return true;
  // first replace all non numbers
  var reg1Str = '[^0-9' + (decimalPlaces != 0 ? '.' : '') + (allowNegative ? '-' : '') + ']';
  var reg1 = new RegExp(reg1Str, 'g');
  temp = temp.replace(reg1, '');
  if (allowNegative)
  {
   // replace extra negative
   var hasNegative = temp.length > 0 && temp.charAt(0) == '-';
   var reg2 = /-/g;
   temp = temp.replace(reg2, '');
   if (hasNegative) temp = '-' + temp;
  }
  if (decimalPlaces != 0)
  {
    var reg3 = /\./g;
    var reg3Array = reg3.exec(temp);
    if (reg3Array != null)
    {
      // keep only first occurrence of .
     //  and the number of places specified by decimalPlaces or the entire string if decimalPlaces < 0
     var reg3Right = temp.substring(reg3Array.index + reg3Array[0].length);
     reg3Right = reg3Right.replace(reg3, '');
     reg3Right = decimalPlaces > 0 ? reg3Right.substring(0, decimalPlaces) : reg3Right;
     temp = temp.substring(0,reg3Array.index) + '.' + reg3Right;
   }
 }
 obj.value = temp;

}
</script>

Thanks for the links.  The second link helped me alot.  Thanks to everyone else also.  The javascript would probably have worked however, I don't know how to access the HTML page of a web part programmatically in SharePoint.  Therefore in this situation, I could not use it but, thanks for the code anyway.

 Again, thanks for everyones' input.