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check if combo box has selection vb.net

Posted on 2016-08-01
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Last Modified: 2016-08-01
i have 3 combo boxes on a form  in vb.net. the 3rd combo needs the selection from both of the previous. How do i check that both cb1 and 2 have items selected?
there is no order of selection the user can change 1 or 2 in either order as long as i can make cb3 respond
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Question by:PeterBaileyUk
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5 Comments
 

Author Comment

by:PeterBaileyUk
ID: 41737456
I just wrote this
  If (String.IsNullOrEmpty(CBNote.SelectedItem)) And (String.IsNullOrEmpty(CBScaleType.SelectedItem)) Then
            Call GetCBData("usp_GetChords")
        End If

not sure if its correct way
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Author Comment

by:PeterBaileyUk
ID: 41737457
apart from the blinding obvious that i need an else and need to move the call to the correct part
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LVL 63

Accepted Solution

by:
Fernando Soto earned 2000 total points
ID: 41737468
You can use the ComboBox.SelectedIndex property to know if a item has been selected in the ComboBox. It returns the zero base index of the selected item or if no item has been selected -1.
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Author Closing Comment

by:PeterBaileyUk
ID: 41737472
I did try and ceremoniously failed. thx again
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LVL 63

Expert Comment

by:Fernando Soto
ID: 41737474
Did you get it working?
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