Datagridview Check Box

In my DatagridView The last Column Is A checkbox Column.
Since I need only one of the checkboxes to be the main one,i want when i click on it all the others to return in a read only state untill i uncheck it

Please Guide me .
LVL 18
John (Yiannis) ToutountzoglouInstructor Multiengine PilotAsked:
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CodeCruiserCommented:
Why not use a RadioButton instead?
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John (Yiannis) ToutountzoglouInstructor Multiengine PilotAuthor Commented:
I never thought about it ..let me check it for a while and i msg you back..
thank you for your reply...
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John (Yiannis) ToutountzoglouInstructor Multiengine PilotAuthor Commented:
How do i represent a radio button in a datagridview ?...there no choise to change a checkbox column to a radio button column.
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John (Yiannis) ToutountzoglouInstructor Multiengine PilotAuthor Commented:
i think it a litle trick for me and not for my level...(it is not vb.net)
How about this..
i need only one check box to be checked
In a total of Rows.Count if >1 checkboxes are checked then message and reject last changes?
This Will Be accomplished by clicking the save button..
I have a code for that is this a good way?
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Bob LearnedCommented:
You might be able to do that by attaching to the EditorControlShowing event handler, checking the state of a module-level state flag, and set the CheckBox.Enabled = False for all other CheckBoxes.
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CodeCruiserCommented:
Button_Click:

Dim CheckboxCount as integer = 0
For i as integer = 0 to grid.Rows.Count - 1
      if CType(grid.Rows(i).Cells("checkboxcolumn").Value, Boolean) = True Then
         CheckboxCount += 1
      end if
Next
If CheckboxCount > 1 then
   'more than one ticks
End If
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John (Yiannis) ToutountzoglouInstructor Multiengine PilotAuthor Commented:
It is working ...i just add the
If CheckboxCount =0 then....
because always i need one to be checked..
thank you CodeCruiser
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John (Yiannis) ToutountzoglouInstructor Multiengine PilotAuthor Commented:
Thanks Also the LearnedOne for his answers
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John (Yiannis) ToutountzoglouInstructor Multiengine PilotAuthor Commented:
Code Cruiser ....just a correction....i change the "Value" with "FormattedValue"
to prevent the DBNULL TO BOOLEAN CONVERSION
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CodeCruiserCommented:
That is a good step. You could also use the IsDBNull function to make sure its not null.
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John (Yiannis) ToutountzoglouInstructor Multiengine PilotAuthor Commented:
i 've done it both ....and both works properly....
see u in another question...thank you very much
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