When you want to use a data bound ComboBox in .NET (C#, VB, etc), you should set a few properties such as DataSource, DisplayMember and ValueMember.
It works fine unless you want to set SelectedValue for the first time. It won’t be set!
I found that BindingContext property must be created before initializing SelectedValue:
ComboBox1.BindingContext = new BindingContext(); ComboBox1.DataSource = MyDataSet.DefaultView ComboBox1.DisplayMember = "Title"; ComboBox1.ValueMember = "Code"; ComboBox1.SelectedValue = 1;