ASP.Net/Validation by Control/Required Field

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Checking Against an Initial Value with a RequiredFieldValidator Control (VB.net)

<%@ Page Language=VB Debug=true %>
<HTML>
<HEAD>
<TITLE>Checking Against an Initial Value with a RequiredFieldValidator Control</TITLE>
</HEAD>
<form runat="server">
<BR><BR>
<asp:textbox 
    id="txtName" 
    text="Enter Your Name"
    runat=server 
/>
<asp:RequiredFieldValidator 
    id="rfvName1"
    controltovalidate="txtName"
    InitialValue="Enter Your Name"
    display="Dynamic"
    font-name="Verdana"
    font-size="10pt"
    forecolor="red"
    runat=server
>
You must enter your name!
</asp:RequiredFieldValidator>
<asp:requiredfieldvalidator 
    id="rfvName2"
    controltovalidate="txtName"
    display="Dynamic"
    font-name="Verdana"
    font-size="10pt"
    forecolor="red"
    runat=server
>
You must enter your name!
</asp:requiredfieldvalidator>
<BR><BR>
<asp:button 
    id="butOK"
    text="OK"
    type="Submit"
    runat="server"
/>
</form>
</BODY>
</HTML>



DropDownList Must Have a Value Selected Other Than the Default

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:DropDownList ID="DropDownList1" runat="server" ValidationGroup="DDL">
            <asp:ListItem>--Please Select--</asp:ListItem>
            <asp:ListItem>Red</asp:ListItem>
            <asp:ListItem>Green</asp:ListItem>
            <asp:ListItem>Blue</asp:ListItem>
        </asp:DropDownList>
        <asp:RequiredFieldValidator ID="RequiredFieldValidator2" 
                                    runat="server" 
                                    ControlToValidate="DropDownList1"
                                    ErrorMessage="DropDownList1 Must Have a Value Selected" 
                                    InitialValue="--Please Select--"
                                    SetFocusOnError="True" 
                                    ValidationGroup="DDL">*</asp:RequiredFieldValidator><br />
    </div>
    </form>
</body>
</html>



Must enter: Required Field Validator (C#)

<%@Page Language="C#"%>
<html>
<body>
<form runat="server">
<asp:textbox id="txtTest" text="delete this" runat="server" />
<asp:RequiredFieldValidator id="valRequired" runat="server"
     ErrorMessage="* You must enter a value in the text box"
     ControlToValidate="txtTest"
     Display="dynamic">
*
</asp:RequiredFieldValidator>
<br />
<asp:button text="Validate" runat="server" />
<asp:ValidationSummary id="valSummary" runat="server"
     HeaderText="<b>The following errors were found:</b>"
     ShowSummary="true"
     DisplayMode="List" />

</form>
</body>
</html>



RequiredFieldValidator Demo: You must enter your name (VB.net)

<%@ Page Language=VB Debug=true %>
<%@ Import Namespace="System.Data" %>
<script runat=server>
</SCRIPT>
<HTML>
<HEAD>
<TITLE>RequiredFieldValidator Control Sample Page</TITLE>
</HEAD>
<BODY >
<form runat="server">
<Font Face="Tahoma">
<BR><BR>
<asp:Label
    id="lblMessage"
    runat="server"
    Font-Bold="True"
    Text="Name"
/>
<asp:TextBox 
    id="txtName" 
    Columns="25"
    MaxLength="30"
    runat=server 
    Text="Name"
/>
<asp:RequiredFieldValidator 
    id="rfvName"
    ControlToValidate="txtName"
    InitialValue="Name"
    Display="Dynamic"
    Font-Name="Verdana"
    Font-Size="10pt"
    runat=server
>
You must enter your name!
</asp:RequiredFieldValidator>
<BR><BR>
<asp:Label
    id="lblMessage2"
    runat="server"
    Font-Bold="True"
    Text="Name 2"
/>
<asp:TextBox 
    id="txtName2" 
    Columns="25"
    MaxLength="30"
    runat=server 
    Text="Name"
/>
<asp:RequiredFieldValidator 
    id="rfvName2"
    ControlToValidate="txtName2"
    InitialValue="Name"
    Display="Dynamic"
    Font-Name="Verdana"
    Font-Size="10pt"
    runat=server
>
You must replace name with your name!
</asp:RequiredFieldValidator>
<asp:RequiredFieldValidator 
    id="rfvName3"
    ControlToValidate="txtName2"
    Display="Dynamic"
    Font-Name="Verdana"
    Font-Size="10pt"
    runat=server
>
You must enter a name!
</asp:RequiredFieldValidator>
<BR><BR>
<asp:button 
    id="butOK"
    text="OK"
    Type="Submit"
    runat="server"
/>
</Font>
</Form>
</BODY>
</HTML>



Required field validator (VB.net)

<%@ Page Language="vb" %>
<html>
<head>
   <title>Validation Control Example</title>
    <script language="javascript">
    <!--
      function ClientValidate(source, arguments)
      {
         //alert(arguments.Value);
         var r, re;      //Declare variables.
         re = new RegExp(/^[1-9][0-9][0-9][0-9]$/);  //Create regular expression object.
         r = re.test(arguments.Value);  //Test for match.
         arguments.IsValid = r;    //Return results.
      }
   -->
   </script>
   <script runat="server">
      Sub Page_Load()
         vsSummary.DisplayMode = ValidationSummaryDisplayMode.List
      End Sub
      Sub ServerValidation (source As object, args As ServerValidateEventArgs)
         Dim RegExVal As New System.Text.RegularExpressions.Regex("^\d{4}$")
         If RegExVal.IsMatch(args.Value) Then
            args.IsValid = True
         Else
            args.IsValid = False
         End If
      End Sub
   </script>
</head>
<body>
   <h1>Validation Control Example</h1>
   <form runat="server">
      <asp:table id="MyTable" border="1" cellpadding="5" cellspacing="0" runat="server">
         <asp:tablerow runat="server">
            <asp:tablecell runat="server">
               RegularExpressionValidator Control:
               <br><br>
               Enter a valid 5 or 9-digit zip code
            </asp:tablecell>
            <asp:tablecell runat="server">
               <asp:textbox id="zipcode" runat="server"/><br>
               <asp:regularexpressionvalidator id="reZipCode"
                  controltovalidate="zipcode"
                  validationexpression="^\d{5}$|^\d{5}-\d{4}$"
                  errormessage="Not a valid Zip code!"
                  display="static"
                  runat="server"/>
            </asp:tablecell>
         </asp:tablerow>
         <asp:tablerow runat="server">
            <asp:tablecell runat="server">
               RequiredFieldValidator Control:
               <br><br>
               Enter a login name
            </asp:tablecell>
            <asp:tablecell runat="server">
               <asp:textbox id="login" runat="server"/><br>
               <asp:requiredfieldvalidator id="rfvLogin"
                  controltovalidate="login" 
                  display="static"
                  errormessage="Login cannot be blank!"
                  runat="server"/>
            </asp:tablecell>
         </asp:tablerow>

         <asp:tablerow runat="server">
            <asp:tablecell runat="server">
               ValidationSummary Control:
            </asp:tablecell>
            <asp:tablecell runat="server">
               <asp:validationsummary id="vsSummary"
                  displaymode="bulletlist" 
                  headertext="Page has the following errors: "
                  showsummary="true" 
                  showmessagebox="false"
                  runat="server"/>
            </asp:tablecell>
         </asp:tablerow>
         <asp:tablerow runat="server">
            <asp:tablecell colspan="2" runat="server">
               <asp:button text="submit" runat="server"/>
            </asp:tablecell>
         </asp:tablerow>
      </asp:table>
      <asp:label id="MyLabel" runat="server"/>
   </form>
</body>
</html>



Validation for aspText: cannot be empty, integer range (MaximumValue,MinimumValue) (VB.net)

<%@ Page Language="VB" %>
<html>
<head>
</head>
<body>
    <form runat="server">
        <p>
            Name: 
            <asp:TextBox id="TextBox1" runat="server"></asp:TextBox>
            <asp:RequiredFieldValidator 
                 id="RequiredFieldValidator1" 
                 runat="server" 
                 ErrorMessage="You must enter your name" 
                 ControlToValidate="TextBox1">Missing name
            </asp:RequiredFieldValidator>
        </p>
        <p>
            Age: 
            <asp:TextBox id="TextBox2" runat="server"></asp:TextBox>
            <asp:RangeValidator 
                 id="RangeValidator1" 
                 runat="server" 
                 ErrorMessage="Age must be between 18 and 75" 
                 ControlToValidate="TextBox2" 
                 MaximumValue="75" 
                 MinimumValue="18" 
                 Type="Integer">18 - 75
            </asp:RangeValidator>
        </p>
        <p>
            <asp:Button id="Button1" runat="server" Text="Button"></asp:Button>
        </p>
        <p>
            <asp:ValidationSummary 
                 id="ValidationSummary1" 
                 runat="server">
            </asp:ValidationSummary>
        </p>
    </form>
</body>
</html>
Источник — «http://nfex.ru/index.php?title=ASP.Net/Validation_by_Control/Required_Field&oldid=1807»