Autocomplete combobox in windows c# : Filter from any location

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C#

Windows

I have bound the combobox using Autocomplete.

But I want all lists after typing words compared from any place either from begening or middle

Ex. If list : [Aman ,Raja, Ramn,Pankaj,Amar,Balram]

If I type 'am', it should filter [Aman , Ramn,Amar,Balram] compare from begening or middle.

I have used the code :

AutoCompleteStringCollection col = new AutoCompleteStringCollection();
            int i = 0;
            for (i = 0; i <= ds.Tables[0].Rows.Count - 1; i++)
            {
                col.Add(ds.Tables[0].Rows[i][FieldsName].ToString());
            }
            cmb1.AutoCompleteSource = AutoCompleteSource.CustomSource;
            cmb1.AutoCompleteCustomSource = col;
            cmb1.AutoCompleteMode = AutoCompleteMode.Suggest;
            con.Close();

But it compare form left only.Please improve the code.