太急了!大家快帮小弟我啊

太急了!!!!!!!!!!!!大家快帮我啊!!!!!!!!!
DAOHelper.ExecuteNonQuery( "update   news   set   newstitle= ' "+this.newstitle.Text.ToString()+ " ',newscontext= ' "+this.newscontext.Text.ToString()+ " ',newsdate= ' "+this.newsdate.Text.ToString()+ " '   where   username   =   ' "+this.newsid.Text.ToString()+ " ' ");


哪里错了呢?

[解决办法]
newsdate是什么类型的?
[解决办法]
newsid是int型,不能有 '号的.
应该是这样的吧.