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Select the control at C, and open the Events window.
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Type the value for Load as sp3DUOmCtrl11_Load in the Events window. You can select this value from the list.
Check the name of the control, and type the values accordingly. In this case, the
control at C is sp3DUOmCtrl1. Check the controls with your form, and type the values accordingly (sp3DUOmCtrlxxx).
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Type the value for ValidityProperty as sp3DUOmCtrl1_ValidateProperty in the Events window, and press ENTER.
You are automatically directed to the Coding page.
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On the Coding page, type the following: MessageBox.Show("Value acceptable");
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For the control at D, type the following code: