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vb.net vs2013 Setfocus not working

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Last Modified: 2015-03-03
Hi, I am having issues to set focus on a textbox. What happens is that when the textbox is empty or null I would like to set the focus on the textbox so the user can add the text. Currently it is not doing it.
The code is the following:

 If (IsNumeric(txtPrecioCompetencia1.Text) = False) Then
            MessageBox.Show("Favor ingrese precio de Competencia 1")
            txtPrecioCompetencia1.Focus()

        ElseIf (String.IsNullOrEmpty(txtPrecioCompetencia1.Text) = False) Then
            MessageBox.Show("Favor ingrese precio de Competencia 1")
            txtPrecioCompetencia1.Focus()
        End If

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