button has class or not c#
//How to check if class attribute contains something?
//https://stackoverflow.com/questions/34992613/how-to-check-if-class-attribute-contains-something
//el is the web element
if(el.getAttribute("class").split(" ").contains("disabled"))
{
//your code
}
or
#region HTML Method
public static bool hasClass(WebControl element, string strClass)
{
return Convert.ToString(element.Attributes["class"]).Split(' ').Contains(strClass);
}
#endregion