Pass the image file path as string in Bitmap

Am trying to pass the path of the image as string parameter in bitmap but am getting the error “The given path’s format is not supported”

for ex : am using
strHTMLPath= “C:\HTML.png”
imgHTML =new Bitmap(strHTMLPath)

but it works well if I give the path as

imgHTML=new Bitmap(“‪C:\HTML.png”)

Does this work? “C:\\HTML.png” … - with 2 slashes
Also, verify with Message Box or Write Line that strHTMLPath is outputting correctly.