FilterValue.CreateShowBlanksValue(GridViewDataColumn, String) Method

Creates and returns the (Blanks) filter item used to filter a column by blank values.

Namespace: DevExpress.Web

Assembly: DevExpress.Web.v24.1.dll

NuGet Package: DevExpress.Web

Declaration

C#

public static FilterValue CreateShowBlanksValue(
    GridViewDataColumn column,
    string text
)

VB.NET

Public Shared Function CreateShowBlanksValue(
    column As GridViewDataColumn,
    text As String
) As FilterValue

Parameters

Name	Type	Description
column	GridViewDataColumn	A GridViewDataColumn object that is the data column.
text	String	A String value that specifies the item’s display text.

Returns

Type	Description
FilterValue	Returns the filter item used to filter by blank values.

Remarks

When creating custom filter values by handling the ASPxGridView.HeaderFilterFillItems event, you can use the CreateShowBlanksValue method to create the (Blanks) filter item. The created item can be added to a header filter using the event argument’s ASPxGridHeaderFilterEventArgs.AddValue method.

Example

C#

using DevExpress.Web.ASPxGridView;
...
protected void ASPxGridView1_HeaderFilterFillItems(object sender, DevExpress.Web.ASPxGridViewHeaderFilterEventArgs e) {
     e.Values.Clear();
     FilterValue showAllItem = FilterValue.CreateShowAllValue("Show All");
     e.Values.Add(showAllItem);
     FilterValue showBlanksItem = FilterValue.CreateShowBlanksValue(e.Column, "Show Blanks");
     e.Values.Add(showBlanksItem);
     FilterValue showNonBlanksItem = FilterValue.CreateShowNonBlanksValue(e.Column, "Show non Blanks");
     e.Values.Add(showNonBlanksItem);
     ...
    }

VB.NET

Imports DevExpress.Web.ASPxGridView
...
Protected Sub ASPxGridView1_HeaderFilterFillItems(ByVal sender As Object, ByVal e As DevExpress.Web.ASPxGridViewHeaderFilterEventArgs)
     e.Values.Add(showNonBlanksItem)
     Dim showAllItem As FilterValue = FilterValue.CreateShowAllValue("Show All")
     e.Values.Add(showAllItem)
     Dim showBlanksItem As FilterValue = FilterValue.CreateShowBlanksValue(e.Column, "Show Blanks")
     e.Values.Add(showBlanksItem)
     Dim showNonBlanksItem As FilterValue = FilterValue.CreateShowNonBlanksValue(e.Column, "Show non Blanks")
     e.Values.Add(showNonBlanksItem)
     ...
End Sub