public enum MyEnum
{
    option1,
    option2,
    option3
}

public void MyFoo(string enumName)
{
    switch ((MyEnum)Enum.Parse(typeof(MyEnum), enumName.ToString()))
    {
        case MyEnum.option1:
        // Do something
            break;
        case MyEnum.option2:
            // Do Something
            break;
        case MyEnum.option3:
            // Do something
            break;            
    }        
}