By default, the C1DatePicker control doesn't allow users to enter null values, but you can force the control to accept a null value by setting the C1DatePicker.AllowNull property to True. In this topic, you will learn how to set the C1DatePicker.AllowNull property to True in the designer, in XAML, and in code.
In the Designer
Complete the following steps:
In XAML
To allow null values, place AllowNull="True" within the <DateTimeEditors:C1DatePicker>tags so that the markup resembles the following:
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Copy Code
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<DateTimeEditors:C1DatePicker AllowNull="True"/>
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In Code
Complete the following steps:
Visual Basic Copy Code C1DatePicker1.AllowNull = True
C# Copy Codec1DatePicker1.AllowNull = true;