asp.net - datagrid with several collimnas with links, and how to process the event of each link

To create additional columns you should only define them in the design

Creating Custom Columns for the ASP.NET Datagrid

I imagine in your grid you define the property AutoGenerateColumns in true. As you will notice in the article there are several ways to achieve it

You could define a columns of type HyperLinkColumn

<asp:DataGrid id="DataGrid1" 
   runat="server"
   AutoGenerateColumns="true">
   <Columns>
      <asp:HyperLinkColumn DataNavigateUrlField="application_id" 
          DataNavigateUrlFormatString="applicationform.aspx?id={0}" 
          DataTextField="application_id" HeaderText="APPLICATION_ID"></asp:HyperLinkColumn>
   </Columns>
</asp:DataGrid>

In this case it would be a link in the column that redirects to a url, the property DataNavigateUrlField

Another alternative would be using <asp:ButtonColumn> .

<asp:DataGrid id="DataGrid1" 
   runat="server"
   AutoGenerateColumns="true">
   <Columns>
        <asp:ButtonColumn 
         HeaderText="Edit item" 
         ButtonType="LinkButton" 
         Text="Edit" 
         CommandName="Edit"/> 
   </Columns>
</asp:DataGrid>

You can define several ButtonColumn as you need

The action is received in the event ItemCommand where you will have the CommandName to know what action was hit

Just what I would advise is that if you want to give a specific position to these columns you define them all in design time and assign the AutoGenerateColumns="false"