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Consider using System.IO.Path.Combine() instead of string concatenation

Let's review the following code for creating a file path:

    public string GetFullPath(string fileName)
    {
        string folder = ConfigurationManager.AppSettings["MyFolder"];
        return folder + fileName;
    }

This code is prone to error. For example, when you set the folder setting, you have to remember to make sure it ends with a slash. To avoid such problems use Path.Combine() method which will ensure that the folder has ending slash:

    public string GetFullPath(string filename)
    {
        string folder = ConfigurationManager.AppSettings["MyFolder"];
        return Path.Combine(folder, filename);
    }