Datagridview - edit selected row? - vb.net

Question

I have set Datagridview .ReadOnly property to True, and then added a button column. Button column is meant for edit button when clicked, but I wish to edin only currently selected row. This is what I tried:
EDIT:
Public Class Form2
Private Sub Form2_Resize(sender As Object, e As EventArgs) Handles Me.Resize
Me.DataGridView1.Height = 0.8 * Me.Height
End Sub
Private Sub Form2_Load(sender As Object, e As EventArgs) Handles MyBase.Load
'TODO: This line of code loads data into the 'Users._USERS' table. You can move, or remove it, as needed.
Me.USERSTableAdapter.Fill(Me.Users._USERS)
Me.DataGridView1.DefaultCellStyle.Font = New Font("Arial", 7)
End Sub
Protected Overrides Sub OnLoad(e As EventArgs)
MyBase.OnLoad(e)
For i As Integer = 0 To DataGridView1.Rows.Count - 1
DataGridView1.Rows(i).ReadOnly = True
Next
End Sub
Private Sub DataGridView1_CellContentClick(sender As Object, e As DataGridViewCellEventArgs) Handles DataGridView1.CellContentClick
Dim yourColumnIndex As Int32 = 3
If e.ColumnIndex = yourColumnIndex Then
If MsgBox("Do you wish to edit records?", vbQuestion + vbYesNo, "Edit records") = vbYes Then
DataGridView1.Rows(e.RowIndex).ReadOnly = False
End If
End If
End Sub
Private Sub DataGridView1_RowLeave(sender As Object, e As DataGridViewCellEventArgs) Handles DataGridView1.RowLeave
DataGridView1.Rows(e.RowIndex).ReadOnly = True
End Sub
End Class

Answer 1

You can't set the grid's ReadOnly property to true. After the rows are added to the grid, you would have to loop through your rows and set the ReadOnly property for each row:
Protected Overrides Sub OnLoad(e As EventArgs)
MyBase.OnLoad(e)
For i As Integer = 0 To DataGridView1.Rows.Count - 1
DataGridView1.Rows(i).ReadOnly = True
Next
End Sub
Note: you can't set these properties in the form's constructor, a quirk of the DataGridView control.
Then use the RowIndex property provided by the e parameter:
Private Sub DataGridView1_CellContentClick(sender As Object,
e As DataGridViewCellEventArgs)
Handles DataGridView1.CellContentClick
If e.ColumnIndex = 3 Then
DataGridView1.Rows(e.RowIndex).ReadOnly = False
End If
End Sub
Set it back to true when leaving the row:
Private Sub DataGridView1_RowLeave(sender As Object,
e As DataGridViewCellEventArgs)
Handles DataGridView1.RowLeave
DataGridView1.Rows(e.RowIndex).ReadOnly = True
End Sub

Answer 2

This is working, I just changed your suggestion a little bit (DatagridView Readonly property must be set to False):
Protected Overrides Sub OnLoad(e As EventArgs)
MyBase.OnLoad(e)
For Each band As DataGridViewBand In DataGridView1.Columns
band.ReadOnly = True
Next
End Sub
Private Sub DataGridView1_CellContentClick(sender As Object, e As DataGridViewCellEventArgs) Handles DataGridView1.CellContentClick
Dim yourColumnIndex As Int32 = 3
If e.ColumnIndex = yourColumnIndex Then
If MsgBox("Do you wish to edit record?", vbQuestion + vbYesNo, "Edit record") = vbYes Then
For Each band As DataGridViewBand In DataGridView1.Columns
band.ReadOnly = False
Next
End If
End If
End Sub
Private Sub DataGridView1_RowLeave(sender As Object, e As DataGridViewCellEventArgs) Handles DataGridView1.RowLeave
For Each band As DataGridViewBand In DataGridView1.Columns
band.ReadOnly = True
Next
End Sub
Thanks for all your help Lars!