Validation for Text Box in ASP.NET C# to input only Integer and Decimal Value

This client side function will Allow only Numeric values and Decimals to input in an text box :-

Step 1:- Write this function on client side script:-

<script type="text/javascript" language="javascript">
     function checkNumeric(event) {
         var kCode = event.keyCode || event.charCode;
         if ((kCode > 57 || kCode < 48) && (kCode != 46 && kCode != 45)) {
         if (window.ActiveXObject) {
         event.keyCode = 0
         return false;
         }
         else
         {
         event.charCode= 0
        }
    }
}
    </script>

Step 2:- Write this onkeypress event in Textbox :-

onkeypress="return checkNumeric(event);"

Server side alert message in ASP.NET C#

ClientScript.RegisterStartupScript(this.GetType(), "", "$(document).ready(function(){alert(' Hi I am alert message !')});", true);