CommandField.CausesValidation Property
Definition
Important
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Gets or sets a value indicating whether validation is performed when the user clicks a button in a CommandField field.
public:
virtual property bool CausesValidation { bool get(); void set(bool value); };public override bool CausesValidation { get; set; }member this.CausesValidation : bool with get, setPublic Overrides Property CausesValidation As BooleanProperty Value
true to perform validation when the user clicks a button in a CommandField field; otherwise, false. The default is true.
Examples
The following code example demonstrates how to use the CausesValidation property to prevent validation from occurring when a button in a CommandField field is clicked.
Important
This example has a text box that accepts user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview.
<%@ Page language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>CommandField CausesValidation Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>CommandField CausesValidation Example</h3>
<!-- Normally, the validation controls declared in the -->
<!-- EditItemTemplate of each TemplateField field column would -->
<!-- prevent the user from leaving a field value empty; however, -->
<!-- because the CausesValidation property of the CommandField -->
<!-- field column is set to false, validation does not occur when -->
<!-- the user clicks a button in the CommandField field column. -->
<asp:gridview id="CustomerGridView"
datasourceid="CustomersSqlDataSource"
autogeneratecolumns="false"
datakeynames="CustomerID"
cellpadding="10"
runat="server">
<columns>
<asp:commandfield showeditbutton="true"
causesvalidation="false"
headertext="Edit"/>
<asp:boundfield datafield="CustomerID"
headertext="Customer ID"
readonly="true"/>
<asp:templatefield headertext="Company Name"
itemstyle-verticalalign="Top">
<itemtemplate>
<%#Eval("CompanyName")%>
</itemtemplate>
<edititemtemplate>
<asp:textbox id="CompanyNameTextBox"
text='<%#Bind("CompanyName")%>'
width="90"
runat="server"/>
<br/>
<asp:requiredfieldvalidator id="CompanyNameRequiredValidator"
controltovalidate="CompanyNameTextBox"
display="Dynamic"
text="Please enter the company name."
runat="server"/>
</edititemtemplate>
</asp:templatefield>
<asp:templatefield headertext="Address"
itemstyle-verticalalign="Top">
<itemtemplate>
<%#Eval("Address")%>
</itemtemplate>
<edititemtemplate>
<asp:textbox id="AddressTextBox"
text='<%#Bind("Address")%>'
width="90"
runat="server"/>
<br/>
<asp:requiredfieldvalidator id="AddressRequiredValidator"
controltovalidate="AddressTextBox"
display="Dynamic"
text="Please enter the address."
runat="server"/>
</edititemtemplate>
</asp:templatefield>
<asp:templatefield headertext="City"
itemstyle-verticalalign="Top">
<itemtemplate>
<%#Eval("City")%>
</itemtemplate>
<edititemtemplate>
<asp:textbox id="CityTextBox"
text='<%#Bind("City")%>'
width="90"
runat="server"/>
<br/>
<asp:requiredfieldvalidator id="CityRequiredValidator"
controltovalidate="CityTextBox"
display="Dynamic"
text="Please enter the city."
runat="server"/>
</edititemtemplate>
</asp:templatefield>
</columns>
</asp:gridview>
<!-- This example uses Microsoft SQL Server and connects -->
<!-- to the Northwind sample database. Use an ASP.NET -->
<!-- expression to retrieve the connection string value -->
<!-- from the Web.config file. -->
<asp:sqldatasource id="CustomersSqlDataSource"
selectcommand="Select [CustomerID], [CompanyName], [Address], [City] From [Customers]"
updatecommand="Update [Customers] Set [CompanyName]=@CompanyName, [Address]=@Address, [City]=@City Where [CustomerID] = @CustomerID"
connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server">
</asp:sqldatasource>
</form>
</body>
</html>
<%@ Page language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>CommandField CausesValidation Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>CommandField CausesValidation Example</h3>
<!-- Normally, the validation controls declared in the -->
<!-- EditItemTemplate of each TemplateField field column would -->
<!-- prevent the user from leaving a field value empty; however, -->
<!-- because the CausesValidation property of the CommandField -->
<!-- field column is set to false, validation does not occur when -->
<!-- the user clicks a button in the CommandField field column. -->
<asp:gridview id="CustomerGridView"
datasourceid="CustomersSqlDataSource"
autogeneratecolumns="false"
datakeynames="CustomerID"
cellpadding="10"
runat="server">
<columns>
<asp:commandfield showeditbutton="true"
causesvalidation="false"
headertext="Edit"/>
<asp:boundfield datafield="CustomerID"
headertext="Customer ID"
readonly="true"/>
<asp:templatefield headertext="Company Name"
itemstyle-verticalalign="Top">
<itemtemplate>
<%#Eval("CompanyName")%>
</itemtemplate>
<edititemtemplate>
<asp:textbox id="CompanyNameTextBox"
text='<%#Bind("CompanyName")%>'
width="90"
runat="server"/>
<br/>
<asp:requiredfieldvalidator id="CompanyNameRequiredValidator"
controltovalidate="CompanyNameTextBox"
display="Dynamic"
text="Please enter the company name."
runat="server"/>
</edititemtemplate>
</asp:templatefield>
<asp:templatefield headertext="Address"
itemstyle-verticalalign="Top">
<itemtemplate>
<%#Eval("Address")%>
</itemtemplate>
<edititemtemplate>
<asp:textbox id="AddressTextBox"
text='<%#Bind("Address")%>'
width="90"
runat="server"/>
<br/>
<asp:requiredfieldvalidator id="AddressRequiredValidator"
controltovalidate="AddressTextBox"
display="Dynamic"
text="Please enter the address."
runat="server"/>
</edititemtemplate>
</asp:templatefield>
<asp:templatefield headertext="City"
itemstyle-verticalalign="Top">
<itemtemplate>
<%#Eval("City")%>
</itemtemplate>
<edititemtemplate>
<asp:textbox id="CityTextBox"
text='<%#Bind("City")%>'
width="90"
runat="server"/>
<br/>
<asp:requiredfieldvalidator id="CityRequiredValidator"
controltovalidate="CityTextBox"
display="Dynamic"
text="Please enter the city."
runat="server"/>
</edititemtemplate>
</asp:templatefield>
</columns>
</asp:gridview>
<!-- This example uses Microsoft SQL Server and connects -->
<!-- to the Northwind sample database. Use an ASP.NET -->
<!-- expression to retrieve the connection string value -->
<!-- from the Web.config file. -->
<asp:sqldatasource id="CustomersSqlDataSource"
selectcommand="Select [CustomerID], [CompanyName], [Address], [City] From [Customers]"
updatecommand="Update [Customers] Set [CompanyName]=@CompanyName, [Address]=@Address, [City]=@City Where [CustomerID] = @CustomerID"
connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server">
</asp:sqldatasource>
</form>
</body>
</html>
Remarks
Use the CausesValidation property to specify whether validation is performed when a button in a CommandField field is clicked. When this property is set to true, by default all validation controls on the page are validated. To limit validation to only a certain group of validation controls, create a validation group and then set the ValidationGroup property to the validation group's name. For more information on validation groups, see BaseValidator.ValidationGroup.
Applies to
See also
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