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How do I create an identifier that is required in order to be unique?

I need to use the uniqueness of the id. Even if you have a 1 in 1 trillion chance, but I can't use it.

But I really don't feel like going to the ends of the earth to find a solution. I've spent some time researching this and everything I've found to date cannot guarantee me a unique ID.

So, I thought I would be using something very simple like:

    public static string GenerateItemID()
    {
        string year = DateTime.Now.Year.ToString(), 
            month = DateTime.Now.Month.ToString(), 
            day = DateTime.Now.Day.ToString(), 
            hour = DateTime.Now.Hour.ToString(), 
            minute = DateTime.Now.Minute.ToString(), 
            second = DateTime.Now.Second.ToString(), 
            millisecond = DateTime.Now.Millisecond.ToString();

        return year + month + day + hour + minute + second + millisecond;
    }

My logic is here: every new user interface that is generated cannot be the same as any of the previous ones. But then I thought, is it possible for a PC to be able to generate two or more of these IDs in one millisecond? Naturally I was then looking for Intellisense for the Nanosecond property, but it doesn't exist.

How can I generate a garunteed id to be unique?

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2 answers 


var id = Guid.NewGuid();


I believe this will create a rather unique identifier.

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Use a GUID.

See here: https://msdn.microsoft.com/en-us/library/system.guid.newguid(v=vs.110).aspx



Hope for this help.

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