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ControlCollection.Add Method

Adds the specified Control object to the collection.

Namespace:  System.Web.UI
Assembly:  System.Web (in System.Web.dll)

public virtual void Add(
	Control child
)

Parameters

child
Type: System.Web.UI.Control

The Control to add to the collection.

ExceptionCondition
ArgumentNullException

Thrown if the child parameter does not specify a control.

HttpException

Thrown if the ControlCollection is read-only.

The new control is added to the end of an ordinal index array. The control can be an instance of any ASP.NET server control, a custom server control you create, or a literal control.

To add a control to the collection at a specific index location, use the AddAt method.

The following code example uses the Add method to add a series of template items, the number of which are taken from the server control's view state, to a custom templated control.

// Override to create repeated items. 
protected override void CreateChildControls() {
    object o = ViewState["NumItems"];
    if (o != null) {
       // Clear any existing child controls.
       Controls.Clear();

       int numItems = (int)o;
       for (int i=0; i < numItems; i++) {
          // Create an item.
          RepeaterItem item = new RepeaterItem(i, null);
          // Initialize the item from the template.
          ItemTemplate.InstantiateIn(item);
          // Add the item to the ControlCollection.
          Controls.Add(item);
       }
    }
}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1
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