how to change transparency of a color in c#

Question

I am using SSRS reportviewer to generate a report using objects. In my program, I am asking the user to input a string of commonly known colors such as \"Red\", \"<

Answer 1

I created a handy extension method.

public static class ColorExtensions
{
    ...
    public static Color WithA(this Color color, int newA) => Color.FromArgb(newA,color);
}

Usage:

newitem.ChartColor = "red";
Color mycolor = Color.FromName(newitem.ChartColor);

Color myColorAlt1 = myColor.WithA(0x56);
Color myColorAlt2 = myColor.WithA(0x28);

or, if you needed it right away:

Color mycolor = Color.FromName(newitem.ChartColor).WithA(0x56);