Change format of Array string

I currently run an array which reads 6 or so lines from a text file. Below is an example of how i'm extracting the required information from the lines in the text file

line = allLines.Where(Function(x) (x.StartsWith("plandate="))).SingleOrDefault()
            If line IsNot Nothing Then
                AllDetails(numfiles).pDate = line.Split("="c)(1)
            End If

In this instance I'm extracting the planned date in the format dd/MM/yy

For part of a sub I need to change the reference of the format from dd/MM/yy to dd MMMM yy.

I've tried the following

Dim uPland As String = AllDetails(n).pDate.ToString("dd MMMM yy")

however i get the following error message

Unable to cast object of type 'System.String' to type 'System.IFormatProvider'.

The format needs to be changed as I folders which are created with dates as a title using the dd MMMM yy format.

If anymore code is needed to be posted then please let me know

Any guidance please

Jon Skeet
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Currently you're never parsing the values as DateTime values - which means you can't format them as DateTime either. The only single-parameter ToString method on String is the one with IFormatProvider as the parameter type, which is why you're getting the error you are.

I suggest you change the type of pDate from String to DateTime, parse (e.g. using DateTime.ParseExact) when you read the file, and then convert back to text in whatever format you're interested in only when you really need to do so.

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