Validation Control of Asp.net




Validation Server Control               Description


CompareValidator         Compares the value of one input control
                to the value of another input control or to 
                a fixed value


CustomValidator         Allows you to write a method to handle 
                the validation of the value entered


RangeValidator         Checks that the user enters a value
                that falls between two values


RegularExpressionValidator Ensures that the value of an input control 
                matches a specified pattern
RequiredFieldValidator         Makes an input control a required field


ValidationSummary Displays a report of all validation errors
                occurred in a Web page


Compare Validations


<asp:CompareValidator id="compval" Display="dynamic" ControlToValidate="txt1" ControlToCompare="txt2" ForeColor="red" BackColor="red" Type="String" EnableClientScript="false"
Text="Validation Failed!" runat="server" />
Custom Validator




<script  runat="server">
Sub user(source As object,args As ServerValidateEventArgs)
   if len(args.Value)<8 or len(args.Value)>16 then
    args.IsValid=false
   else
    args.IsValid=true
   end if
End Sub
</script>   


<html>
<body>


<form runat="server">
<asp:Label runat="server" Text="Enter a username: " />
<asp:TextBox id="txt1" runat="server" />
<asp:Button Text="Submit" runat="server"/>
<br />
<asp:Label id="mess" runat="server"/>
<br />
<asp:CustomValidator
ControlToValidate="txt1"
OnServerValidate="user"
Text="A username must be between 8 and 16 characters!"
runat="server"/>
</form>


</body>
</html>
---------------------------------------------------------------------------
Range Validator


<asp:RangeValidator ControlToValidate="tbox1" MinimumValue="2005-01-01"
MaximumValue="2005-12-31" Type="Date" EnableClientScript="false"
Text="The date must be between 2005-01-01 and 2005-12-31!" runat="server" />


Regular Expression Validator


<asp:RegularExpressionValidator ControlToValidate="txtbox1" ValidationExpression="\d{5}"
EnableClientScript="false" ErrorMessage="The zip code must be 5  digits!" runat="server" />


RequiredField Validator


<asp:RequiredFieldValidator ControlToValidate="name" Text="The name field is required!"
runat="server" />


Validation Summary


<form runat="server">
<table>
<tr>
<td>
<table bgcolor="#b0c4de" cellspacing="10">
   <tr>
     <td align="right">Name:</td>
     <td><asp:TextBox id="txt_name" runat="server"/></td>
     <td>
     <asp:RequiredFieldValidator
     ControlToValidate="txt_name" 
     ErrorMessage="Name"
     Text="*" 
     runat="server"/>
     </td>
   </tr>
   <tr>
     <td align="right">Card Type:</td>
     <td>
     <asp:RadioButtonList id="rlist_type" 
     RepeatLayout="Flow"
     runat="server">
     <asp:ListItem>Diners</asp:ListItem>
     <asp:ListItem>MasterCard</asp:ListItem>
     <asp:ListItem>Visa</asp:ListItem>
     </asp:RadioButtonList>
     </td>
     <td>
     <asp:RequiredFieldValidator
     ControlToValidate="rlist_type"
     ErrorMessage="Card Type"
     InitialValue=""
     Text="*"
     runat="server"/>
     </td>
   </tr>
   <tr>
     <td></td>
     <td><asp:Button id="b1" Text="Submit" runat="server"/></td>
     <td></td>
   </tr>
</table>
</td>
</tr>
</table>
<br />
<asp:ValidationSummary
HeaderText="You must enter a value in the following fields:"
DisplayMode="BulletList"
EnableClientScript="true"
runat="server"/>
</form>


</body>
</html>

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