how i can do d validations for input text fields that come when i do edit command in datagrid.
for e.g. i need to validate a input text box text for not to be special char. when i do update.


Please tell me how can i write function for custom validator to restrict special char.s


function fn_isspChar(source, arguments)
            {
                var CheckArr = new Array("'","`","%","@","!","#","$","&","*","(",")", "[","]","{","}","^","#","&","\"","-","=","|","+",",");

                for(i=0;i<CheckArr.length;i++)
                {
                    if(arguments.Value.indexOf(CheckArr[i]) >=0)
                    {
                        //alert("cannot contain " + CheckArr[i]);
                         arguments.IsValid=false;

                        t = eval("document.all." + source.controltovalidate);
                        t.focus();
                        t.select();
                        //break;
                    }

                    else
                    {
                        arguments.IsValid=true;
                    }
                }
            }


i've written this function.
it works pretty gud when i put alert...
but it takes only last special char in the array "CheckArr " for check when i go for setting "IsValid" i.e. ","

Have you tried using the built-in regular expression object that is part of .NET?

Here is the one I'm using to validate an email text box. You can look up the correct regular expression syntax you're looking for once you get this validator to work for you.

<asp:RegularExpressionValidator ID="regexEmail" Display="Dynamic" Runat="server" ControlToValidate="txtUserEmail" ValidationExpression="^[a-zA-Z][\w\.-]*[a-zA-Z0-9]@[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$" ErrorMessage="&nbsp;&nbsp;Please enter a valid email address." />