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FormViewCommandEventHandler Delegate

Represents the method that handles the ItemCommand event of a FormView control. This class cannot be inherited.

Namespace:  System.Web.UI.WebControls
Assembly:  System.Web (in System.Web.dll)
public delegate void FormViewCommandEventHandler(
	Object sender,
	FormViewCommandEventArgs e
)

Parameters

sender
Type: System.Object

The source of the event.

e
Type: System.Web.UI.WebControls.FormViewCommandEventArgs

A FormViewCommandEventArgs that contains the event data.

The ItemCommand event is raised when a button within the FormView control is clicked. This allows you to provide an event-handling method that performs a custom routine whenever this event occurs.

Buttons within a FormView control can also invoke some of the built-in functionality of the control. To perform one of these operations, set the CommandName property of a button to one of the values in the following table.

CommandName value

Description

"Cancel"

Cancels an edit or insert operation and returns the FormView control to the mode specified by the DefaultMode property. Raises the ModeChanged and ModeChanging events.

"Delete"

Deletes the current record. Raises the ItemDeleted and ItemDeleting events.

"Edit"

Puts the FormView control in edit mode. Raises the ModeChanged and ModeChanging events.

"Insert"

Inserts the current record in the data source. Raises the ItemInserted and ItemInserting events.

"New"

Puts the FormView control in insert mode. Raises the ModeChanged and ModeChanging events.

"Page"

Performs a paging operation. Set the CommandArgument property of the button to "First", "Last", "Next", "Prev", or a page number to specify the type of paging operation to perform. Raises the PageIndexChanged and PageIndexChanging events.

"Update"

Updates the current record in the data source. Raises the ItemUpdated and ItemUpdating events.

Although the ItemCommand event is raised when a button listed in the previous table is clicked, it is recommended that you handle the events listed in the table for the operation.

When you create a FormViewCommandEventHandler delegate, you identify the method that will handle the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, unless you remove the delegate. For more information about event-handler delegates, see Events and Delegates.

The following example demonstrates how to programmatically add a FormViewCommandEventHandler delegate to the ItemCommand event of a FormView control.

<%@ page language="C#" %>
<%@ import namespace="System.Data"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

  // To dynamically create a template for a FormView control,
  // you must create a custom template class to represent 
  // the template. This template class represents the item
  // template for a FormView control.
  private sealed class EmployeeTemplate : ITemplate
  {

    // When implementing the ITemplate interface, you must
    // implement the InstantiateIn method. The FormView
    // control calls this method to create the template's 
    // content. 
    void ITemplate.InstantiateIn(Control container)
    {
      // Create the child controls contained in the template.
      // For this example, the item template displays the
      // FirstName and LastName fields from the data source.
      // To support data binding, create event handlers 
      // for the DataBinding event of each child control.
      // The event handlers must bind the appropriate value 
      // to each control.
      Label firstNameLabel = new Label();
      firstNameLabel.ID = "FirstNameLabel";
      firstNameLabel.DataBinding += new EventHandler(FirstNameLabel_DataBinding);

      LiteralControl nameLineBreak = new LiteralControl("<br/>");
      LiteralControl buttonLineBreak = new LiteralControl("<br/>");

      Label lastNameLabel = new Label();
      lastNameLabel.ID = "LastNameLabel";
      lastNameLabel.DataBinding += new EventHandler(LastNameLabel_DataBinding);

      // Create a custom button control to display in the item
      // template. When a button within a FormView control is 
      // clicked, the ItemCommand event is raised. The ItemCommand
      // event is used to handle the clicking of this button.
      Button displayButton = new Button();
      displayButton.ID = "AddButton";
      displayButton.CommandName = "Display";
      displayButton.Text = "Display Employee";

      // Add the controls to the Controls collection of the 
      // container control.
      container.Controls.Add(firstNameLabel);
      container.Controls.Add(nameLineBreak);
      container.Controls.Add(lastNameLabel);
      container.Controls.Add(buttonLineBreak);
      container.Controls.Add(displayButton);

    }

    // This event handler binds the value of the FirstName field
    // to the FirstNameLabel Label control displayed in the template.
    private void FirstNameLabel_DataBinding(Object sender, EventArgs e)
    {
      // Use the sender parameter to retrieve the Label control
      // being bound to data.
      Label firstNameLabelControl = (Label)sender;

      // Retrieve the value to bind to the Label control. First,
      // use the NamingContainer property to retrieve the parent 
      // control of the Label control. In this example, the parent 
      // control is the FormView control.
      FormView formViewContainer = (FormView)firstNameLabelControl.NamingContainer;

      // Get the data item bound to the FormView control.
      DataRowView rowView = (DataRowView)formViewContainer.DataItem;

      // Use the data item to retrieve the value of the FirstName field.
      // Set the Text property of the Label control to this value.        
      firstNameLabelControl.Text = rowView["FirstName"].ToString();
    }

    // This event handler binds the value of the LastName field
    // to the LastNameLabel Label control displayed in the template.
    private void LastNameLabel_DataBinding(Object sender, EventArgs e)
    {
      // Use the sender parameter to retrieve the Label control
      // being bound to data.
      Label lastNameLabelControl = (Label)sender;

      // Retrieve the value to bind to the Label control. First,
      // use the NamingContainer property to retrieve the parent 
      // control of the Label control. In this example, the parent 
      // control is the FormView control.
      FormView formViewContainer = (FormView)lastNameLabelControl.NamingContainer;

      // Get the data item bound to the FormView control.
      DataRowView rowView = (DataRowView)formViewContainer.DataItem;

      // Use the data item to retrieve the value of the LastName field.
      // Set the Text property of the Label control to this value.         
      lastNameLabelControl.Text = rowView["LastName"].ToString();
    }

  }

  void Page_Load(Object sender, EventArgs e)
  {

    // Create a new FormView object.
    FormView employeesFormView = new FormView();

    // Set the FormView object's properties.
    employeesFormView.ID = "EmployeesFormView";
    employeesFormView.DataSourceID = "EmployeeSource";
    employeesFormView.AllowPaging = true;
    employeesFormView.HeaderText = "Employee Name";

    // Programmatically register the event handlers for the 
    // FormView control.
    employeesFormView.ItemCommand += new FormViewCommandEventHandler(EmployeesFormView_ItemCommand);
    employeesFormView.PageIndexChanged += new EventHandler(EmployeesFormView_PageIndexChanged);

    // Create the dynamic template using the custom template class.
    employeesFormView.ItemTemplate = new EmployeeTemplate();

    // Add the FormView object to the Controls collection
    // of the PlaceHolder control.
    FormViewPlaceHolder.Controls.Add(employeesFormView);

  }

  void EmployeesFormView_ItemCommand(Object sender, FormViewCommandEventArgs e)
  {

    // The ItemCommand event is raised when any button within
    // the FormView control is clicked. Use the CommandName property 
    // to determine which button was clicked. 
    if (e.CommandName == "Display")
    {

      // Use the sender parameter to get the FormView control
      // that contains the button clicked.
      FormView employeesFormView = (FormView)sender;

      // Use the Row property to retrieve the data row.
      FormViewRow row = employeesFormView.Row;

      // Retrieve the FirstNameLabel and LastNameLabel Label controls 
      // from the data row.
      Label firstNameLabel = (Label)row.FindControl("FirstNameLabel");
      Label lastNameLabel = (Label)row.FindControl("LastNameLabel");

      if (firstNameLabel != null && lastNameLabel != null)
      {
        // Display the employee's name.
        MessageLabel.Text = firstNameLabel.Text + " " + 
          lastNameLabel.Text;
      }

    }

  }

  void EmployeesFormView_PageIndexChanged(Object sender, EventArgs e)
  {

    // Clear the message label when the user navigates to 
    // a different record.
    MessageLabel.Text = "";

  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" > 
  <head runat="server">
    <title>FormViewCommandEventHandler Example</title>
</head>
<body>
    <form id="form1" runat="server">

      <h3>FormViewCommandEventHandler Example</h3>

      <!-- Use a PlaceHolder control as the container for the -->
      <!-- dynamically generated FormView control.            -->       
      <asp:placeholder id="FormViewPlaceHolder"
        runat="server"/>

      <br/><br/>

      <asp:label id="MessageLabel"
        forecolor="Red"
        runat="server"/>

      <!-- 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="EmployeeSource"
        selectcommand="Select [EmployeeID], [LastName], [FirstName] From [Employees]"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" 
        runat="server"/>

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

The following example demonstrates how to declaratively add a FormViewCommandEventHandler delegate to the ItemCommand event of a FormView control.

<%@ page language="C#" %>
<%@ import namespace="System.Data"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

  void EmployeesFormView_ItemCommand(Object sender, FormViewCommandEventArgs e)
  {

    // The ItemCommand event is raised when any button within
    // the FormView control is clicked. Use the CommandName property 
    // to determine which button was clicked. 
    if (e.CommandName == "Display")
    {

      // Use the Row property to retrieve the data row.
      FormViewRow row = EmployeesFormView.Row;

      // Retrieve the FirstNameLabel and LastNameLabel Label controls 
      // from data row.
      Label firstNameLabel = (Label)row.FindControl("FirstNameLabel");
      Label lastNameLabel = (Label)row.FindControl("LastNameLabel");

      if (firstNameLabel != null && lastNameLabel != null)
      {
        // Display the employee's name.
        MessageLabel.Text = firstNameLabel.Text + " " + 
          lastNameLabel.Text;
      }

    }

  }

  void EmployeesFormView_PageIndexChanged(Object sender, EventArgs e)
  {

    // Clear the message label when the user navigates to 
    // a different record.
    MessageLabel.Text = "";

  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" > 
  <head runat="server">
    <title>FormViewCommandEventHandler Example</title>
</head>
<body>
    <form id="form1" runat="server">

      <h3>FormViewCommandEventHandler Example</h3>

      <!-- Use a PlaceHolder control as the container for the -->
      <!-- dynamically generated FormView control.            -->       
      <asp:formview id="EmployeesFormView"
        datasourceid="EmployeeSource"
        allowpaging="True"
        headertext="Employee Name"
        onitemcommand="EmployeesFormView_ItemCommand"
        onpageindexchanged="EmployeesFormView_PageIndexChanged"
        runat="server">

        <itemtemplate>

          <asp:label id="FirstNameLabel"
            text='<%# Eval("FirstName") %>'
            runat="server"/>
          <br/>
          <asp:label id="LastNameLabel"
            text='<%# Eval("LastName") %>'
            runat="server"/>
          <br/>
          <asp:button
            id="DisplayButton"
            text="Display Employee"
            commandname="Display" 
            runat="server"/>

        </itemtemplate>

      </asp:formview>

      <br/><br/>

      <asp:label id="MessageLabel"
        forecolor="Red"
        runat="server"/>

      <!-- 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="EmployeeSource"
        selectcommand="Select [EmployeeID], [LastName], [FirstName] From [Employees]"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" 
        runat="server"/>

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

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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