DataGridView Cascading/Dependent ComboBox Columns

To have dependent (cascading or master/slave) ComboBox columns in DataGridView, you can follow this steps: Set DataSource of slave column to all available values. Goal: Here the goal is prevent rendering errors at first load, so all slave combo boxes can show value correctly. Hanlde EditingControlShowing event of the grid and check if the current … Read more

Transparency of picture box

You are correct in your assumption. Transparency in winforms does not mean that the object is actually transparent. Instead, it means that it will display it’s parent object instead of it’s background, including it’s background, images and text, but not including any other controls on it, hence your problem. Since the parent control of your … Read more

How to make SendKeys act Synchronously in IBM Host Access Library

The “Operator Information Area” class seems to provide a solution for this problem. My general case seems to be working correctly with this implementation: Friend Sub PutTextWithEnter(ByVal field As FieldDefinition, ByVal value As String) If IsNothing(field) Then Throw New ArgumentNullException(“field”) If IsNothing(value) Then Throw New ArgumentNullException(“value”) _Presentation.SendKeys(Mid(value.Trim, 1, field.Length).PadRight(field.Length) & “[enter]”, field.Row, field.Column) WaitForEmulator(_Session.Handle) End … Read more

Why am I getting, “Object reference not set to an instance of an object.” but no line of code is implicated?

This was an incredibly strange issue, but since there it has been solved, it might as well get an answer. I think it’s a bug in the .suo files, as my VS was behaving oddly lately, my programs suddenly started crashing, not building and saying the Office references were not valid. One fix I tried … Read more