Hi,

I tried it out and I get the results you describe. I guess it does this just in case the Value property is bound to a data source.

You can, of course, have your code check for DBNull as well as null, but I can understand how that might be a bit of a pain to do that everywhere in your application.

So another way you could deal with this is to use a DataFilter to convert the text into the value you want (null). Here's a sample DataFilter class I whipped up. You can create a single instance of this class and set the DataFilter of all your UltraNumericEditors to the same instance.

    public class MyNullDataFilter : IEditorDataFilter
    {
        #region IEditorDataFilter Members

        object IEditorDataFilter.Convert(EditorDataFilterConvertArgs conversionArgs)
        {
            switch (conversionArgs.Direction)
            {
                case ConversionDirection.DisplayToEditor:
                    string s = conversionArgs.Value.ToString().Trim();
                    if (String.IsNullOrEmpty(s))
                    {
                        // When the user enters an empty string, return null instead of
                        // DBNull.Value. 
                        conversionArgs.Handled = true;
                        return null;
                    }
                    break;
            }

            // Do nothing. 
            return null;
        }

        #endregion
    }

Hi Mike

Thanks for your reply.

No, it's an unbound control.

Control in Designer.cs:

//
// numericEditor
//
this.numericEditor.Location = new System.Drawing.Point(124, 19);
this.numericEditor.MaxValue = 120;
this.numericEditor.MinValue = 1;
this.numericEditor.Name = "tbLUExpirationDuration";
this.numericEditor.Nullable = true;
this.numericEditor.PromptChar = ' ';
this.numericEditor.Size = new System.Drawing.Size(62, 21);
this.numericEditor.SpinButtonDisplayStyle = Infragistics.Win.ButtonDisplayStyle.Always;
this.numericEditor.SpinIncrement = 1;
this.numericEditor.TabIndex = 15;
this.numericEditor.Value = null;