How to enter data in datagridtextcolumn at runtime. And add new row at the end of datagrid for new data...?

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WPF

<datagrid name="itemGrid" grid.row="5" grid.column="0" grid.columnspan="4" autogeneratecolumns="False" margin="0,25,0,5" grid.rowspan="2" canuserreordercolumns="False" canuserresizecolumns="False" canusersortcolumns="False" selectionunit="Cell" canuserresizerows="False">

<datagrid.columns>

<datagridtextcolumn header="Sr No." width="50">
<datagridtemplatecolumn header="Item" width="300">
<datagridtemplatecolumn.celltemplate>
<datatemplate>
<local:filteredcombobox x:name="FilteredComboBox1" itemssource="{Binding}" itemspanel="{DynamicResource ItemsTemplate}" xmlns:x="#unknown" xmlns:local="#unknown">



<datagridtextcolumn header="Quantity" width="100">
<datagridtextcolumn header="Unit Price" width="100">
<datagridtextcolumn header="Vat %" width="100">
<datagridtextcolumn header="Discount" width="100">
<datagridtextcolumn header="Sub-Total" width="170">

<comboboxitem>