// if you have an HTML string
var lightGray = System.Drawing.ColorTranslator.FromHtml("#D3D3D3");
// if you have 3 hex numbers
var lightGray = System.Drawing.Color.FromArgb(0xD3, 0xD3, 0xD3);
// you can specify known color names
var lightGray = Color.LightGray;
// if you want to specify an alpha (transperancy) you can use FromArgb
// the first int is the transperancy. 255 is solid while 0 is fully transperant
var lightGray = Color.FromArgb(255, 0xD3, 0xD3, 0xD3);
// you can also use integers with FromArgb
var lightGray = Color.FromArgb(255, 211, 211, 211);
// if you are using WPF and you want to specify an alpha in HTML style you can do this
using System.Windows.Media;
var lightGray = (Color)ColorConverter.ConvertFromString("#FFD3D3D3");