C# DateTime check is incorrect

I've got a 开发者_运维百科little problem with some code of mine. The case is as follows:

There is a ListView which contains some measurement data. One of the data items is a status. This status can be 10, 20 of 30. This depends on the value of the next measurement date.

What I do is this. I take the next measurement date and check if the current data + 3 month is higher then the next measurement date. If so, I return status 30. If the current date >= the next measurement date, I should return 20. Else I return 10.

So, in short: current date + 3 months > next measurement date = status 30; current date >= next measurement date = status 20; else = status 10;

The problem is that when the next measement date is higher then the next measurement date, status 30 is allways returned. Below is my code:

private string getMsaStatus(DateTime dtNextMsa)
    {
        if (DateTime.Now.AddMonths(3) > dtNextMsa)
        {
            return "30";
        }
        else if (DateTime.Now >= dtNextMsa)
        {
            return "20";
        }
        else
        {
            return "10";
        }
    }

You need to change it like this:

if (DateTime.Now >= dtNextMsa.AddMonths(3))
{
    return "30";
}
else if (DateTime.Now >= dtNextMsa)
{
    return "20";
}
else
{
    return "10";
}

This code takes into account the clarification in your comment.