AutoscaleMode.Dpi not working as expected

Question

I'm developing a CAB-based application in VS.NET 2005 in C# that has a view/form with multiple custom controls. These controls each have a combination of a label and a textbox checkbox combobox or datetimepicker. The machine I'm currently developing on is currently set for 120 DPI while the machine I'm testing on is at 96 DPI. All of the alignments are fine when I run the app on the 120 DPI machine but when I run it on the 96 DPI machine the alignments of each control are staggered randomly and the distance between the control's label and its respective textbox combobox checkbox etc is much greater than it's supposed to be. Currently the AutoscaleMode for each control view and the shell is set to Dpi. Does anyone know what's going on here and how to fix it ? Thanks.

Stef · Answer

I've configured Windows XP as 120dpi. When setting these settings in the code from the form: AutoScaleDimensions = new System.Drawing.SizeF(96F96F); AutoScaleMode = AutoScaleMode.Dpi; Nothing changes.

James · Answer

Ok... things look a little better on the 96 DPI side. Here's the problem: I have a custom control consisting of a label and textbox and the label is scaled down as is the textbox's height. However the textbox's width is not scaled down. It just stays the same no matter what DPI. Would anyone happen to have a clue as to why this happens ? I never manually set the textbox's width anywhere.

James · Answer

For the 120 DPI machine I'm developing on both of those dimensions are set to 120 DPI. I'll try to set those to 96 and see what happens. What do I do though to support more than one DPI ? I forgot to mention that the user doesn't necessarily have their screen set to 96 or 120.

Scott Lysle · Answer

James: Are you setting the AutoScaleDimensions property for the 96dpi size first: e.g. AutoScaleDimensions = new System.Drawing.SizeF(96F96F); AutoScaleMode = AutoScaleMode.Dpi;