Validation ASP.Net Tutorial

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<%@ Page Language="C#"%>



    Using ValidationSummary


    
    

      
      Book
      
      
         Please pick a book
         A
         B
         C
      
                                        runat="server" 
                                  ControlToValidate="lstBooks" 
                                  SetFocusOnError="true"
                                  Text="*"
                                  InitialValue="0" 
                                  Display="static" 
                                  ErrorMessage="Please choose a book from list"/>
      
      User Name:
      
                                        runat="server" 
                                  ControlToValidate="txtUserName" 
                                  SetFocusOnError="true"
                                  Text="*"
                                  Display="static" 
                                  ErrorMessage="Please enter a User Name"/>
      
      Password:
      
                                        runat="server" 
                                  ControlToValidate="txtPassword"  
                                  SetFocusOnError="true"
                                  Text="*"
                                  Display="static" 
                                  ErrorMessage="Please enter a password"/>
            
      
                                   runat="server"   
                         DisplayMode="BulletList"
                         HeaderText="The following errors were found:"
                         ShowMessageBox="false" 
                         ShowSummary="true" />