Combine data from two datatable in one datatable

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C#3.5

Hi all

I return data from two table and set in two datatable as following and how it does collect data from two datatable and set in one :

DataTable gg = new DataTable();
DataTable kk = new DataTable();
gg=ff.select_ghesting_whith_where_coloumn_pay_and_dont_pay(code_m_buyer.Text,comboBox2.Text);
 
kk= ff.select_tasive_befor_moed(code_m_buyer.Text, comboBox2.Text);