Ridiculous MinDate MaxDate assignign error

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C#

DateTime

I am writing a desktop application in c# using VS2013. I am getting an absurd error that has not to be produced, in my opinion. I am setting a DateTimePicker's MinDate and MaxDate properties somewhere in the code in such way:

DateTime minDate = DateTime.Parse(...);
DateTime maxDate = DateTime.Parse(...);

...

if (maxDate < dtpManuelFirst.MinDate)
{
    dtpManuelFirst.MinDate = minDate;
    dtpManuelFirst.MaxDate = maxDate;
}
else
{
    if (minDate > dtpManuelFirst.MaxDate)
    {
        dtpManuelFirst.MaxDate = maxDate;
        dtpManuelFirst.MinDate = minDate;
    }
    else
    {
        dtpManuelFirst.MinDate = minDate;
        dtpManuelFirst.MaxDate = maxDate;
    }
}

Very initially i know that minDate value is always less than maxDate value. This is absolute. When minDate is bigger than dtpManuelFirst.MaxDate like the second if condition, it updates the MaxDate property with no problem whereas i get the error "value is not valid for MinDate. MinDate must be less than MaxDate." on updating the MinDate property. It is ridiculous since i am already checking these conditions. In addition, the values are not supporting the error when i check in debug mode. Let say dtpManuelFirst.Mindate is 25.01.2014 and dtpManuelFirst.MaxDate is 27.01.2014. Let say minDate is 18.04.2014 and maxDate is 19.04.2014. then it will be going to the second if statement and enter in it. Updating firstly MaxDate property will not produce an error. Now we have dtpManuelFirst.MaxDate is 19.04.2014 and dtpManuelFirst.MinDate is 25.01.2014. Under these conditions it generates the error while assignign minDate value to MinDate property. Any help would be great!