How to force character casing (capitalized) in a ComboBox C#? Is it possible?

I'm using a ComboBox control (windows forms) with auto complete, and I found out that there is no CharacterCasing Property on it. What I'm trying to accomplish is to echo upper case letters on the ComboBox.

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comboBox1.DropDownStyle = DropDownStyle.DropDown;

//comboBox1.CharacterCasing = CharacterCasing.Upper ???

Here's how I populate the comboBox:

ComboBox cb =开发者_Go百科 (ComboBox)sender;
                pl.cmd = new SqlCommand("LOOKUP", pl.ConnOpen());
                pl.cmd.CommandType = CommandType.StoredProcedure;
                pl.cmd.Parameters.Add(new SqlParameter("@TABLENAME", (object)tableName));
                pl.da = new SqlDataAdapter(pl.cmd);
                dt = new DataTable("dt");
                pl.da.Fill(dt);
                cb.DataSource = dt;
                cb.ValueMember = valueMember;
                cb.DisplayMember = displayMember;

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Try this:

WPF ComboBox, force input to UpperCase