ASP.NET Validation Controls with example

 Learning Technique for freshers : R3C2  
   
 1.RequiredFieldValidation Control  
 2.RangeValidator Control  
 3.RegularExpressionValidator Control  
 4.CompareValidator Control  
 5.CustomValidator Control  
   
 Properties of Validation Controls.  
   
 ControlToValidate - Id of control Which you want to validate.  
 ErrorMessage - Message that will be displayed in the validation summary.  
 IsValid - Whether or not the control is valid.  
 Validate - Method to validate the input control and update the IsValid property.  
 Display - How the error message will display.options are given below  
 None:Message is never displayed.  
 Static:Validation message will display in the page layout.  
 Dynamic:Validation message is dynamically added to the page if validation fails.  
   
 Example with code:  
   
 1.RequiredFieldValidation:It is simple validation control which checks data is entered or not.  
 <asp:textbox id="txtEmpName" runat="server"/>  
 <asp:RequiredFieldValidator id="rfvtxtbox" runat="server" ControlToValidate="txtEmpName"  
 ErrorMessage="* Please enter the employee name" Display="dynamic">*  
 </asp:RequiredFieldValidator>  
   
 2.RangeValidator:It checks to see if a control value is within a valid range or not.  
 <asp:textbox id="txtDOB" runat="server"/>  
 <asp:RangeValidator id="rangeVal" runat="server"  
 ControlToValidate="txtDOB1"  
 MaximumValue="12/06/2009"  
 MinimumValue="01/01/1983"  
 Type="Date"  
 ErrorMessage="* Please enter the valid date" Display="static">*</asp:RangeValidator>  
   
 3.RegularExpressionValidator:It can be used for email validation or any specified string based on pattern matching.  
 E-mail: <asp:textbox id="txtEmail" runat="server"/>  
 <asp:RegularExpressionValidator id="revemail" runat="server"  
 ControlToValidate="txtEmail"  
 ValidationExpression=".*@.*\..*"  
 ErrorMessage="* Please enter valid e-mail ."  
 display="dynamic">*  
 </asp:RegularExpressionValidator>  
   
 4.CompareValidator: It allows you to make comparisons between two form controls and also compare values contained with  
 these controls to constants that specified by userd.  
   
 New Password: <asp:textbox id="txtNewPass" runat="server"/><br />  
 Confirm Passowrd: <asp:textbox id="txtConfirmPass" runat="server"/><br />  
 <asp:CompareValidator id="valCompare" runat="server"  
 ControlToValidate="txtNewPass" ControlToCompare="txtConfirmPass"  
 Operator="Equals"  
 ErrorMessage="* New Password and confirm password are not same"  
 Display="dynamic">*  
 </asp:CompareValidator>  
   
 5.CustomValidator:It allows you to write your own server-side or client-side validations logic and it can be easily applied to your web forms controls.  
 <asp:CustomValidator ID="cv" runat="server"   
 ControlToValidate="txtName" ClientValidationFunction="customvalidationr"   
 ErrorMessage="Please enter correct name"></asp:CustomValidator>  
 <asp:TextBox ID="txtName" runat="server"></asp:TextBox>  
 <asp:Button ID="btnSubmit" runat="server" />  
   
 Client side javascript  
   
 <script type="text/javascript">  
 function customvalidation(oSrc,args)  
 {   
   
 write your code here  
 }  
 </script>