.NET Framework 4.6 and 4.5
Returns an Integer value that represents the next file number available for use by the FileOpen function.
public static int FreeFile()
Type: System.Int32Returns an Integer value that represents the next file number available for use by the FileOpen function.
More than 255 files are in use.
Use FreeFile to supply a file number that is not already being used.
This example uses the FreeFile function to return the next available file number. Five files are opened for output within the loop, and some sample data is written to each.
Dim count As Integer
Dim fileNumber As Integer
For count = 1 To 5
fileNumber = FreeFile()
FileOpen(fileNumber, "TEST" & count & ".TXT", OpenMode.Output)
PrintLine(fileNumber, "This is a sample.")
Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1
.NET Framework Client Profile
Supported in: 4, 3.5 SP1