First question post in StackOverflow and still alive it
When setting a form's opacity should I use a decimal or double? I want to use a track-bar to change a form's opacity. This is my code: decimal trans = trackBar1.Value / 5000; this.Opacity = trans; When I try to build it, I get this error: Cannot implicitly convert type 'decimal' to 'double'. I tried making trans a double, but then the control doesn't work. This code has worked fine for me in VB.NET in the past. Answer An explicit cast to double isn't necessary. double trans = (double)trackBar1.Value / 5000.0; Identifying the constant as 5000.0 (or as 5000d) is sufficient: double trans = trackBar1.Value / 5000.0; double trans = trackBar1.Value / 5000d; Url http://stackoverflow.com/questions/4/