error ระหว่าง system.object กับ system.string[] ผมเอา script task(integration serviec) มาจาก MSDN ครับ

      Const EOL As String = ControlChars.CrLf

        Dim results As String
        Dim filesInFolder As String()
        Dim fileInFolder As String
        Dim tablesInFile As String()
        Dim tableInFile As String

        results = _
          "Final values of variables:" & EOL & _
          "ExcelFile: " & Dts.Variables("ExcelFile").Value.ToString & EOL & _
          "ExcelFileExists: " & Dts.Variables("ExcelFileExists").Value.ToString & EOL & _
          "ExcelTable: " & Dts.Variables("ExcelTable").Value.ToString & EOL & _
          "ExcelTableExists: " & Dts.Variables("ExcelTableExists").Value.ToString & EOL & _
          "ExcelFolder: " & Dts.Variables("ExcelFolder").Value.ToString & EOL & _
          EOL

        results &= "Excel files in folder: " & EOL
        filesInFolder = CType(Dts.Variables("ExcelFiles").Value, String()) <<<<<<<<<<< error here
        For Each fileInFolder In filesInFolder
            results &= " " & fileInFolder & EOL
        Next
        results &= EOL

        results &= "Excel tables in file: " & EOL
        tablesInFile = CType(Dts.Variables("ExcelTables").Value, String()) <<<<<<<<<<< error here
        For Each tableInFile In tablesInFile
            results &= " " & tableInFile & EOL
        Next

        MessageBox.Show(results, "Results", MessageBoxButtons.OK, MessageBoxIcon.Information)

        Dts.TaskResult = Dts.Results.Success