Syntax
| Visual Basic (Declaration) | |
|---|---|
Public Overridable Property NullColor As Color | |
| Visual Basic (Usage) |  Copy Code |
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Dim instance As SuperEditBase Dim value As Color instance.NullColor = value value = instance.NullColor | |
| C# | |
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public virtual Color NullColor {get; set;} | |
Property Value
Color object containing the background color of the edit controlRemarks
This property indicates to the user that the control contains the null value. The background color of the control changes to the specified color when the control loses the focus.
When the AllowNull property is set to true, the control accepts null values, and the user can provide a null value in the following ways:
- Press F2.
- Delete the contents of the control.
- Call the SetNull method.
- Call the ClearAll method.
- Select the contents of the control and call the Clear method.
This property is available from the SuperEditBase class.
The AllowNull property must be set to true for the NullColor property to work correctly.
You can return whether a control contains the null value by calling the IsNull method.
Example
| C# | Copy Code |
|---|---|
private void Form1_Load(object sender, System.EventArgs e) { control.NullColor = Color.Coral; control.AllowNull = true; control.CausesValidation = true; control.Text = ""; } private void button1_Click(object sender, System.EventArgs e) { control.ResetNullColor(); } | |
| Visual Basic | Copy Code |
|---|---|
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load control.NullColor = Color.Coral control.AllowNull = True control.CausesValidation = True control.Text = "" End Sub Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click control.ResetNullColor() End Sub | |
Requirements
Target Platforms: Windows 2000 Professional (SP4), Windows 2000 Server, Windows 2003 Server (SP1), Windows 2008, Windows XP (SP2), Windows Vista, Windows 7, Windows 8