Select, Update, Delete and Custom link operation in GridView

Follow this link for Update and Delete operation
http://www.dotnetfunda.com/articles/article1619-how-to-perform-edit-update-and-delete-operation-in-gridview.aspx

For Select operation, follow this link
http://www.dotnetfunda.com/articles/article1616-how-to-generate-edit-delete-update-and-select-buttons-automatically.aspx

And for Custom Link, follow this link
http://www.dotnetfunda.com/articles/article1622-how-to-add-a-button-with-custom-command-name-and-perform-an-operation.aspx