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FreeFile Method

FileSystem.FreeFile Method

Returns an Integer value that represents the next file number available for use by the FileOpen function.

Namespace:  Microsoft.VisualBasic
Assembly:  Microsoft.VisualBasic (in Microsoft.VisualBasic.dll)

public static int FreeFile()

Return Value

Type: System.Int32
Returns an Integer value that represents the next file number available for use by the FileOpen function.

ExceptionCondition
IOException

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.")
    FileClose(fileNumber)
Next

.NET Framework

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
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