write into text file

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C#

VB

I have a function that write into text file,the function run without any error, but when i check the text i see that nothing happens, the file is empty.

the Problem appear when i want to write to partition "C",i tried on "D" it's work, but why ?

--->>

Sub WritePass(ByVal _FilePath As String, ByVal _Pass As String)
        Try
            If System.IO.File.Exists(_FilePath) = True Then

                Dim objWriter As New System.IO.StreamWriter(_FilePath)

                objWriter.Write(_Pass)
                objWriter.Close()
                MsgBox("Text written to file")


            Else

                MsgBox("File Does Not Exist")

            End If
        Catch ex As Exception
        End Try

    End Sub