Hi Peryan,

To achieve this, you must handle the keydown event, look for 'Ctrl+V' keys, check for data in the clipboard and for multiple selected cells. Once all the former conditions are met, you have to set the selected cell values with the clipboard data.

I have a code snippet that would do what you need:

    Private Sub ugMain_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles ugMain.KeyDown
        Select Case e.KeyCode
            Case Keys.V
                ' check for control key down
                If e.Control = True Then

                    ' retrieve data from clipboard
                    Dim doClipboard As DataObject = DirectCast(Clipboard.GetDataObject(), DataObject)
                    ' test for CSV data available
                    If doClipboard.GetDataPresent(DataFormats.Text, True) Then

                        ' retrieve CSV data into a memory stream
                        Dim msClipboard As String
                        msClipboard = DirectCast(doClipboard.GetData(DataFormats.Text, True), String)

                        Dim str() As String = msClipboard.Split(New String() {vbCrLf}, StringSplitOptions.RemoveEmptyEntries)
                        ' Paste one cell to multiple cells
                        If str.Length = 1 AndAlso Me.ugMain.Selected.Cells.Count > 1 Then

                            For Each cell As Infragistics.Win.UltraWinGrid.UltraGridCell In Me.ugMain.Selected.Cells
                                cell.Value = str(0)                                
                                ' Does not seem to work: cells are deactivated/reactivated after this sub                               
                                cell.Selected = True
                            Next
                        End If
                    End If
                End If
        End Select
    End Sub