ASP.NET Tutorial/Validation/Introduction

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Disabling Validation

Set False to CausesValidation property of Button, LinkButton, and ImageButton control
then clicking the button bypasses any validation in the page.
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
    void btnCancel_Click(Object sender, EventArgs e)
    {
        Response.Redirect("~/Default.aspx");
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Show Disable Validation</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:Label
        id="lblFirstName"
        Text="First Name:"
        AssociatedControlID="txtFirstName"
        Runat="server" />
    <asp:TextBox
        id="txtFirstName"
        Runat="server" />
    <asp:RequiredFieldValidator
        id="reqFirstName"
        ControlToValidate="txtFirstName"
        Text="(Required)"
        Runat="server" />
    <asp:Button
        id="btnSubmit"
        Text="Submit"
        Runat="server" />
    <asp:Button
        id="btnCancel"
        Text="Cancel"
        OnClick="btnCancel_Click"
        CausesValidation="false"
        Runat="server" />
    </div>
    </form>
</body>
</html>


ServerValidateEventArgs has two properties:

Value:   the value of the form field being validated.
IsValid: whether validation fails or succeeds.
ValidateEmptyText: whether validation is performed without a value.
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
    void valComments_ServerValidate(Object source, ServerValidateEventArgs args)
    {
        if (args.Value.Length > 10)
            args.IsValid = false;
        else
            args.IsValid = true;
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <script type="text/javascript">
    function valComments_ClientValidate(source, args)
    {
        if (args.Value.length > 10)
            args.IsValid = false;
        else
            args.IsValid = true;
    }
    </script>
    <title>Show CustomValidator with JavaScript</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:Label
        id="lblComments"
        Text="Comments:"
        AssociatedControlID="txtComments"
        Runat="server" />
    <br />
    <asp:TextBox
        id="txtComments"
        TextMode="MultiLine"
        Columns="30"
        Rows="5"
        Runat="server" />
    <asp:CustomValidator
        id="valComments"
        ControlToValidate="txtComments"
        Text="(Comments must be less than 10 characters)"
        OnServerValidate="valComments_ServerValidate"
        ClientValidationFunction="valComments_ClientValidate"
        Runat="server" />
    <asp:Button
        id="btnSubmit"
        Text="Submit"
        Runat="server" />
    </div>
    </form>
</body>
</html>


Six validation controls are included in the ASP.NET 3.5 Framework:

RequiredFieldValidator: require a user to enter a value in a form field.
RangeValidator:         check whether a value falls between a certain minimum and maximum value.
CompareValidator:       compare a value against another value or perform a data type check.
RegularExpressionValidator: compare a value against a regular expression.
CustomValidator:        perform custom validation.
ValidationSummary:      display a summary of all validation errors in a page.

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
    void btnSubmit_Click(Object sender, EventArgs e)
    {
        if (Page.IsValid)
        {
            lblResult.Text = @"<br />Product: " + txtProductName.Text
                + "<br />Price: " + txtProductPrice.Text
                + "<br />Quantity: " + txtProductQuantity.Text;
        }
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Order Form</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <fieldset>
    <legend>Order Form</legend>
    <asp:Label
        id="lblProductName"
        Text="Product Name:"
        AssociatedControlID="txtProductName"
        Runat="server" />
    <br />
    <asp:TextBox
        id="txtProductName"
        Runat="server" />
    <asp:RequiredFieldValidator
        id="reqProductName"
        ControlToValidate="txtProductName"
        Text="(Required)"
        Runat="server" />
    <br /><br />
    <asp:Label
        id="lblProductPrice"
        Text="Product Price:"
        AssociatedControlID="txtProductPrice"
        Runat="server" />
    <br />
    <asp:TextBox
        id="txtProductPrice"
        Columns="5"
        Runat="server" />
    <asp:RequiredFieldValidator
        id="reqProductPrice"
        ControlToValidate="txtProductPrice"
        Text="(Required)"
        Display="Dynamic"
        Runat="server" />
    <asp:CompareValidator
        id="cmpProductPrice"
        ControlToValidate="txtProductPrice"
        Text="(Invalid Price)"
        Operator="DataTypeCheck"
        Type="Currency"
        Runat="server" />
    <asp:Label
        id="lblProductQuantity"
        Text="Product Quantity:"
        AssociatedControlID="txtProductQuantity"
        Runat="server" />
    <br />
    <asp:TextBox
        id="txtProductQuantity"
        Columns="5"
        Runat="server" />
    <asp:RequiredFieldValidator
        id="reqProductQuantity"
        ControlToValidate="txtProductQuantity"
        Text="(Required)"
        Display="Dynamic"
        Runat="server" />
    <asp:CompareValidator
        id="CompareValidator1"
        ControlToValidate="txtProductQuantity"
        Text="(Invalid Quantity)"
        Operator="DataTypeCheck"
        Type="Integer"
        Runat="server" />
    <asp:Button
        id="btnSubmit"
        Text="Submit Product Order"
        OnClick="btnSubmit_Click"
        Runat="server" />
    </fieldset>
    <asp:Label
        id="lblResult"
        Runat="server" />
    </div>
    </form>
</body>
</html>
Источник — «http://nfex.ru/index.php?title=ASP.NET_Tutorial/Validation/Introduction&oldid=3060»