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Formatting Values
How to: Format Date-Time Values Using the LongDate Pattern
How to: Format Date-Time Values Using a Custom Format Pattern
How to: Format a Numeric Value according to its Sign
How to: Add Custom Text to a Formatted String
How to: Create a Custom Formatter to Change the Case of String Values
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How to: Format a Numeric Value according to its Sign

The following example shows how to provide different formats for positive and negative numeric values and the zero value in a CalcEdit editor.

The result is demonstrated in the image below.

FormatDisplayAndEditValues_customFormat

using DevExpress.Utils;
// ...
calcEdit1.Properties.DisplayFormat.FormatType = FormatType.Numeric;
calcEdit1.Properties.DisplayFormat.FormatString = "#.00;[#.0];Zero";