using variable as the name of text file saved

I wonder if there is any way to make the file saved with a variable as its name. Any ideas? Please help! :)

The name of a file is just a string. If you variable contains a string then its as good a choice as any other string. There's no functional difference between this:

vb.net Code:

IO.File.WriteAllText("MyFile.txt", "Hello World")

and this:

vb.net Code:

Dim fileName As String = "MyFile.txt"
 
IO.File.WriteAllText(fileName, "Hello World")

There is definitely a way - simply replace the text of the file name with your variable name by using the & operator to combine the strings together (as I assume you already have the directory path where this would be saved in another string).

If I have a RichTextBox1, and I want to save the text inside into txt file with a variable file name. How to do it? I mean how to assign the rtbox1 for it to save? Thanks!

Quote:

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I mean how to assign the rtbox1 for it to save?

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Thats completely different to the original question but its the same kind of answer. Assign the text to a variable and then use the variable where you would have to otherwise type a literal string.
Having said that, the RTB control has a SaveFile method which you can use in this specific case. Example:

vb Code:

RichTextBox1.SaveFile("C:\example.txt")

So if you wanted to use a variable as the file name, you could do this (obviously this example just saves it in the root of the C drive but you get the idea) :

vb Code:

RichTextBox1.SaveFile("C:\" & MyVariable)

Where obviously MyVariable is your variable that contains the file name.

To do it more 'properly' you can use IO.Path.Combine as well, like so:

vb Code:

RichTextBox1.SaveFile(IO.Path.Combine("C:\", MyVariable))