Get the html control to asp without using runat='server' property

string strValue = Page.Request.Form["name of the control"].ToString();

How to get the current row in the grid view rowcommand event

GridViewRow row = ((LinkButton)e.CommandSource).NamingContainer as GridViewRow;

In RowDataBound for datakeys

GridView1.DataKeys[e.Row.RowIndex].Value.ToString()

((DataRowView)e.Row.DataItem)["mainid"].ToString()