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ComboBox cbo = new ComboBox();
cbo.DropDownStyle = ComboBoxStyle.DropDownList;
cbo.Location = new System.Drawing.Point(73, 171);
cbo.Name = "cboCont";
this.Controls.Add(cbo);
绑定combobox
TextBox txtbox = new TextBox();
txtbox.Parent = this;
txtbox.Left = 0;
txtbox.Top = 0;
ComboBox combox = new ComboBox();
combox.Parent = this;
combox.Left = txtbox.Right + 10;
combox.Top = 0;
combox.Visible = false;
txtbox.Tag = combox;
txtbox.TextChanged += new EventHandler(
delegate(object obj, EventArgs ex)
{
((ComboBox)((TextBox)obj).Tag).Visible = !string.IsNullOrEmpty(((TextBox)obj).Text);
}
);