Filter listbox data by using datagridview cell

private void searchLedger(string value)
{
    cn.Open();
    SqlCommand cmd = new SqlCommand("Select * from LedgerCreation  Where  ledgerName  like '%" + value + "%' and AddClassification =@AddClassification order by LedgerName", cn);
    cmd.Parameters.AddWithValue("@AddClassification", "Cash/Bank");
    //SqlCommand cmd = new SqlCommand(searchquery, cn);
    SqlDataAdapter da = new SqlDataAdapter(cmd);
    DataTable table = new DataTable();
    da.Fill(table);
    LstReceipt.DataSource = table;
    LstReceipt.DisplayMember = "LedgerName";
    cn.Close();

private void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
    if (dataGridView1.CurrentCell.ColumnIndex == 1)
    {
        searchLedger(dataGridView1.CurrentRow.Cells[0].FormattedValue.ToString());       
    }
}