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DataRepeater.DrawItem Event

Occurs when a DataRepeaterItem must be drawn.

Namespace:  Microsoft.VisualBasic.PowerPacks
Assembly:  Microsoft.VisualBasic.PowerPacks.Vs (in Microsoft.VisualBasic.PowerPacks.Vs.dll)

public event DataRepeaterItemEventHandler DrawItem

Use this event to change the appearance of DataRepeaterItem objects as they are scrolled into view.

At run time, appearance-related properties can be set based on conditions as each item is scrolled into view. For example, in a scheduling application, you might change the background color of an item to warn users when an item is past due. If you set a property in a conditional statement such as If…Then, you must also use an Else clause to specify the appearance when the condition is not met.

For more information about how to handle events, see Consuming Events.

Some common customizations for the DataRepeater control include displaying the rows in alternating colors and changing the color of a field based on a condition. The following example shows how to perform these customizations. This example assumes that you have a DataRepeater control that is bound to the Products table in the Northwind database.

private void dataRepeater1_DrawItem(object sender, 
    Microsoft.VisualBasic.PowerPacks.DataRepeaterItemEventArgs e)
{
    // Alternate the back color. 
    if ((e.DataRepeaterItem.ItemIndex % 2) != 0)
    // Apply the secondary back color.
    {
        e.DataRepeaterItem.BackColor = Color.AliceBlue;
    }
    else
    {
        // Apply the default back color.
        e.DataRepeaterItem.BackColor = Color.White;
    }
    // Change the color of out-of-stock items to red. 
    if (e.DataRepeaterItem.Controls["unitsInStockTextBox"].Text == "0")
    {
        e.DataRepeaterItem.Controls["unitsInStockTextBox"].BackColor = Color.Red;
    }
    else
    {
        e.DataRepeaterItem.Controls["unitsInStockTextBox"].BackColor = Color.White;
    }
}

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