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DataBoundControl.PerformDataBinding Method

When overridden in a derived class, binds data from the data source to the control.

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

protected internal virtual void PerformDataBinding(
	IEnumerable data
)

Parameters

data
Type: System.Collections.IEnumerable

The IEnumerable list of data returned from a PerformSelect method call.

Implement this method instead of the DataBind method when you derive a data-bound control from the DataBoundControl class. Placing your control's data-binding logic in PerformDataBinding enables you to avoid the DataBinding and DataBound events being raised in the wrong order.

While the base DataBoundControl class provides no specific implementation for this method, the PerformDataBinding method is called by the PerformSelect method to bind the values of any user interface (UI) controls to the data that is retrieved by the PerformSelect method.

The following code example demonstrates how to implement the PerformDataBinding method in a class derived from DataBoundControl. The TextBoxSet control creates a TextBox control for each data item it is bound to. This code example is part of a larger example provided for the DataBoundControl class.

protected override void PerformDataBinding(IEnumerable retrievedData) {
    base.PerformDataBinding(retrievedData);

    // If the data is retrieved from an IDataSource as an  
    // IEnumerable collection, attempt to bind its values to a  
    // set of TextBox controls. 
    if (retrievedData != null) {

        foreach (object dataItem in retrievedData) {

            TextBox box = new TextBox();

            // The dataItem is not just a string, but potentially 
            // a System.Data.DataRowView or some other container.  
            // If DataTextField is set, use it to determine which  
            // field to render. Otherwise, use the first field.                     
            if (DataTextField.Length > 0) {
                box.Text = DataBinder.GetPropertyValue(dataItem, 
                    DataTextField, null);
            }
            else {
                PropertyDescriptorCollection props = 
                    TypeDescriptor.GetProperties(dataItem);

                // Set the "default" value of the TextBox.
                box.Text = String.Empty;

                // Set the true data-bound value of the TextBox, 
                // if possible. 
                if (props.Count >= 1) {                        
                    if (null != props[0].GetValue(dataItem)) {
                        box.Text = props[0].GetValue(dataItem).ToString();
                    }
                }
            }                                        

            BoxSet.Add(box);
        }
    }
}

.NET Framework

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

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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