加载时默认选中GridView的第一行

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            //绑定表格
            BindGridView();
            //构造
            CommandEventArgs cm=new CommandEventArgs("choose",(gvChoosedMemberList.Rows[0].FindControl("lbtnMemberChoose") as LinkButton).CommandArgument);
            GridViewCommandEventArgs arg=new GridViewCommandEventArgs(gvChoosedMemberList.Rows[0],cm);
            gvChoosedMemberList_RowCommand(null, arg);
         }
    }