insert DataGridViewComboBoxColumn once in a DataGridView on form load

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I have this code below

VB

cmb.HeaderText = "Promoted To"
cmb.Name = "cmb"
cmb.MaxDropDownItems = 4
cmb.items.add("Class 2")   
cmb.items.add("Class 3")
DataGridView.Columns.Insert(4, cmb)

this code is at form load and each time i load the form, the DataGridViewComboBoxColumn is inserted at position 4.but i want the DataGridViewComboBoxColumn to be inserted once and if it already exit it should not be inserted again.

Posted 6-Oct-12 3:53am

wizy@2020

Updated 6-Oct-12 3:58am

Kenneth Haugland

v2

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Dave Kreskowiak · Answer 1 · 2012-10-06T05:06:00

This doesn't make sense. If you're "loading" the form more than once, you're creating a new instance of it which has no knowledge of any previous instance. This means that every instance should be creating it's combo column in position 4 every time.

Or am I missing something that you didn't explain in your post?

Divya RS · Answer 2 · 2012-10-07T23:06:00

if you want the combo to be inserted only the first time the pageloads u can put ur code inside Not IsPostback loop of page load

If Not IsPostBack

VB

cmb.HeaderText = "Promoted To"
cmb.Name = "cmb"
cmb.MaxDropDownItems = 4
cmb.items.add("Class 2")
cmb.items.add("Class 3")
DataGridView.Columns.Insert(4, cmb)

End If

wizy@2020 · Answer 3 · 2012-10-07T10:47:00

i have 7 columns so when the form is loaded for the first time, the number of columns become 8 because of the insertion of the cmb.
so i use this code to prevent further insertion of cmb

VB

If DataGridView.Columns.Count < 8 Then
                   Dim cmb As New DataGridViewComboBoxColumn()
                   cmb.HeaderText = "Promoted To"
                   cmb.Name = "cmb"
                   cmb.MaxDropDownItems = 4
                   DataGridView.Columns.Insert(4, cmb)
               End If

insert DataGridViewComboBoxColumn once in a DataGridView on form load

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