求教取gridview当前行值的问题

Question

protected void Gridbookbig_RowCommand(object sender, GridViewCommandEventArgs e)
    {
        int i_rowindex;
        int bbid;
        if (e.CommandName == "delbookbig")
        {            i_rowindex = Convert.ToInt32(e.CommandArgument.ToString());//获取当前行索引
            bbid = Convert.ToInt32(Gridbookbig.Rows[i_rowindex].Cells[0].Text);//获取当前行的id值
            string sql;
            sql = "delete from BookbigT where bbid=" + bbid + "";
            string StrConn = ConfigurationManager.ConnectionStrings["ConnString"].ConnectionString;
            ExecPro.ExecPro.ExecuteDataset(StrConn, CommandType.Text, sql);
            
            Gridbookbig.DataSource = ExecPro.ExecPro.ExecuteDataset(StrConn, CommandType.StoredProcedure, "bookbigpro");
            Gridbookbig.DataBind();
            Response.Write("<script language=javascript>alert('删除成功！');history.back(-1);</script>");
        }
我做的是一个删除命令，bbid 在数据库里是int类型且是自动编号，对应的id绑定在gridview的第一行,我对赋值上面还不太清楚，bbid = Convert.ToInt32(Gridbookbig.Rows[i_rowindex].Cells[0].Text)这样进行转换运行起来提示我错误要我调试，我把该行注销掉则会提示具体错误。对bbid类型那一行的该怎么样进行转换，求教高手，在线等答复

Answer 1

GridViewRow row = GridView1.Rows[ i_rowindex ]; 
string id = row.Cells[0].Text; 
不行用DataKeys