vb2010 datagridview auto text

I would like for my datagridview to automatically fill in the column's next row with the previous entry + 1 letter. So say my datagrid is like this:

ID NextField
15-3A xxxxx
15-3B xxxxx
15-3C xxxxx

Everything is working fine if I type it in but would be nice if the user didn't have to type this each time and just have it fill in the next consecutive ID automatically when you press down to start a new row. Also i need it to work no matter what gets typed in... so if I make another ID 15-4A it will start filling in 15-4B etc. on each new row.

Any Ideas?

Thanks

Well, you should be using a GUID to identify each key. Then, you can assign/change each generated number when you want, even if editing is not allowed!

Link tables via their GUID, and you'll have no problems with keys

I have looked at it and I'm just not able to understand how to do it, I've never worked with GUID's. I'm using MS Access as my database, my key is just a text type, GUID is not an option. Is there some code example you can think of that will make my datagridview "ID" column's next row default the previous row's ID + the next consecutive letter?

Only if you code it by hand..

That's what I've been needing help with, the code...

I can do the current code which works fine for putting in a default value:

Private Sub DataGridView1_DefaultValuesNeeded(ByVal sender As Object, _
ByVal e As System.Windows.Forms.DataGridViewRowEventArgs) _
Handles DataGridView1.DefaultValuesNeeded

With e.Row
.Cells("ID").Value = "15-4A"
End With

End Sub

Can anyone think of a way to modify it to work with my application? I need the value of "15-4A" to be the "last row + next consecutive letter" so the datagrid will fill in "15-4B", "15-4C", etc., not keep repeating "15-4A"?

Thanks

Sure. Each letter has a numerical value, so you'd use the lowest A or a, to the upper z or Z.

You'd have to write a module to generate the value by hand. Pass the current value, and add one. You have to know what to do when it overflows, though

I'm not concerned with overflow... I won't have more than 10 letters used. One last thing I thought of, is there a default expression for access that may be easier than coding all this in? If so, what would it be?

Thanks

I don't know if this is the "best" way to do it, but it got the job done for anyone looking to do this. Maybe someone can come up with a much more simple way, I'm a noob! I had to hide a textbox in the form too, to make this work.




Private Sub ConBreakDataDataGridView_DefaultValuesNeeded(ByVal sender As Object, _
ByVal e As System.Windows.Forms.DataGridViewRowEventArgs) _
Handles ConBreakDataDataGridView.DefaultValuesNeeded

'Make your textbox display the datagridview cell

TextBox1.Text = Me.DataGridView.CurrentRow.Cells("ID").Value.ToString

Dim cnt As Integer

' count the characters in textbox1
cnt = Len(TextBox1.Text)

'Selects from the left always one character shorter than the last character in your field.
'Do this for however many characters you want to have in your field (I have 12).
Dim string1 As String = Microsoft.VisualBasic.Left(Me.TextBox1.Text, 0)
Dim string2 As String = Microsoft.VisualBasic.Left(Me.TextBox1.Text, 1)

'Select only the last character in your field (from the right).
Dim chglast As String = Microsoft.VisualBasic.Right(Me.TextBox1.Text, 1)

'Make your textbox display your left string and your right string
If cnt = 1 Then
Me.TextBox1.Text = string1 & (Chr(Asc(chglast) + 1))
ElseIf cnt = 2 Then
Me.TextBox1.Text = string2 & (Chr(Asc(chglast) + 1))
'Add one of these statements for every string you have (I have 12)

'Limit the size of your character field
ElseIf cnt > 12 Then
MsgBox("Please use 12 or less characters.")
ElseIf cnt < 1 Then
MsgBox("ID cannot be blank.")
End If

'Make your next row's field display your updated textbox value as default

With e.Row
.Cells("ID").Value = TextBox1.Text
End With

End Sub

http://www.freevbcode.com/ShowCode.asp?ID=5440 ???

Code:

---

Function IncrementString(ByVal strString As String) As String
'
' Increments a string counter
' e.g.  "a" -> "b"
'      "az" -> "ba"
'      "zzz" -> "aaaa"
'
' strString is the string to increment, assumed to be lower-case alphabetic
' Return value is the incremented string
'

  Dim lngLenString As Long
  Dim strChar As String
  Dim lngI As Long
 
  lngLenString = Len(strString)
 
  ' Start at far right
  For lngI = lngLenString To 0 Step -1
 
    ' If we reach the far left then add an A and exit
    If lngI = 0 Then
      strString = "a" & strString
      Exit For
    End If
   
    ' Consider next character
    strChar = Mid(strString, lngI, 1)
    If strChar = "z" Then
      ' If we find Z then increment this to A
      ' and increment the character after this (in next loop iteration)
      strString = Left$(strString, lngI - 1) & "a" & Mid(strString, lngI + 1, lngLenString)
    Else
      ' Increment this non-Z and exit
      strString = Left$(strString, lngI - 1) & Chr(Asc(strChar) + 1) & Mid(strString, lngI + 1, lngLenString)
      Exit For
    End If
   
  Next lngI

  IncrementString = strString
  Exit Function
 
End Function

---