Question

In my VB.net win form application, when I clicked Load button I am displaying a filename from a folder onto a Datagridview. Then after I click on Process button the file will be moved to another folder. After file has been moved, Grid has to be refreshed.

Here is the code i have written. I can able to move the file but not refreshing the Grid.Any suggestions please?

 Public Class Form1
 Private Sub Load_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)Handles Load.Click

    With DataGridView1
        .Columns.Add("Column 0", "TaskName")
        .AutoResizeColumns()
    End With

    Dim rowint As Integer = 0

    'Dim directoryInfo As New System.IO.DirectoryInfo("C:\Users\Desktop\auto")
    'Dim fileInfo = System.IO.Directory.GetFiles(directoryInfo.ToString)
    'Dim name As String

    DataGridView1.Rows.Add()
    Dim filename As String = System.IO.Path.GetFileName("C:\Users\Ram\Desktop\auto\INQUEUE\123.txt")
    DataGridView1.Item(0, rowint).Value = filename
    rowint = rowint + 1

End Sub

Private Sub Process_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Process.Click
    System.IO.File.Move("C:\Users\Ram\Desktop\auto\INQUEUE\123.txt", "C:\Users\Ram\Desktop\Demo\abc.txt")
    System.IO.File.Delete("C:\Users\Ram\Desktop\auto\INQUEUE\123.txt")
    DataGridView1.Refresh()
End Sub

End Class

Answer 1

The Refresh() method only redraws the existing grid to the screen again. You will need to reload the grid’s data by performing a “click”. This can be done by calling the event directly or by using the PerformClick() method.

Private Sub Process_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Process.Click
    System.IO.File.Move("C:\Users\Ram\Desktop\auto\INQUEUE\123.txt", "C:\Users\Ram\Desktop\Demo\abc.txt")
    System.IO.File.Delete("C:\Users\Ram\Desktop\auto\INQUEUE\123.txt")
    Load_Click(Load, Nothing)
    DataGridView1.Refresh()
End Sub

—- or —-

Private Sub Process_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Process.Click
    System.IO.File.Move("C:\Users\Ram\Desktop\auto\INQUEUE\123.txt", "C:\Users\Ram\Desktop\Demo\abc.txt")
    System.IO.File.Delete("C:\Users\Ram\Desktop\auto\INQUEUE\123.txt")
    Load.PerformClick()
    DataGridView1.Refresh()
End Sub