Add an AutoNumber column to a DataGrid, such as a control

First, positive sequence
A, Allowpaging=false case
<asp:datagrid id= "DATAGRID1" runat= "Server" >
<Columns>
<asp:TemplateColumn>
<ItemTemplate>
<%# Container.itemindex + 1%>
</ItemTemplate>
</asp:TemplateColumn>
</Columns>
</asp:DataGrid>

can be achieved
But the more interesting approach is to use this method
<asp:datagrid id= "DATAGRID1" runat= "Server" >
<Columns>
<asp:TemplateColumn>
<ItemTemplate>
<%# this. DataGrid1.Items.Count + 1%>
</ItemTemplate>
</asp:TemplateColumn>
</Columns>
</asp:DataGrid>


Some people may find it strange why items.count is like this, not all the sum. But it's easy to understand if you understand the binding process.
[From above it is binding in the ItemCreated event so the Items.Count is exactly the current ordinal number]
B, allowpaging= under "True"
If you have a DataGrid that supports paging, you can do the following
<asp:datagrid id= "DATAGRID1" runat= "Server" allowpaging= "True" >
<Columns>
<asp:TemplateColumn>
<ItemTemplate>
<%# this. Datagrid1.currentpageindex * this. Datagrid1.pagesize + Container.itemindex + 1%>
</ItemTemplate>
</asp:TemplateColumn>
</Columns>
</asp:DataGrid>


Second, the reverse method
Serial number
Content

4
Taye

3
BOx

2
Glass

1
StarCraft

By the above can know to use
This. Datagrid1.items.count-container.itemindex + 1 method is impossible to achieve, get the value and the plenary is 1
Paging is more the case. So we're going to get the number of rows from the data source at first.
. CS

private int rowscount = 0;
protected int Rowscount
{
get{return rowscount;}