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Private Sub ComboBox1_Validating(sender As Object, e As CancelEventArgs) Handles ComboBox1.Validating If ComboBox1.Text String.Empty AndAlso Not ComboBox1.Items.Contains(ComboBox1.Text) Then ComboBox1.SelectAll() MessageBox.Show("Please select an item in the drop-down list", "Invalid Item", MessageBoxButtons.OK, MessageBoxIcon.Exclamation ... mod combo wa gb
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