How to make my combobox autocomplete with multiple columns

Question

Hi!

 

I want to ask some help this problem. I want my combobox autocomplete dropdown in how many columns and merge the rows in one combo box text.

 

 

 

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string conStringBranchFund = txtpath;
SqlConnection connBranchFund = new SqlConnection(conStringBranchFund);
connBranchFund.Open();
string query = "select AccountNumberBranch, AccountBank, AccountNumber from AccountNumBranch order by AccountNumber";
SqlCommand cmd = new SqlCommand(query, connBranchFund);
SqlDataReader reader = cmd.ExecuteReader();

while (reader.Read())
{

CbBranchFunds.Text = reader.GetString(0) + " (" + reader.GetString(1) + ") " + reader.GetString(2);
}

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This code display only one row, the last row. I want to be drop completely  in how many columns ...thank you in advance.