string t;
for(int i=0;i<this.lVw .Items .Count ;i++)
            {
                if(this.lVw .Items [i].SubItems [1].Text .CompareTo (this.lVw .Items [i+1].SubItems [1].Text )>0)
                {
                    t=this.lVw .Items [i+1].SubItems [1].Text ;
                    this.lVw .Items [i+1].SubItems [1].Text =this.lVw .Items [i].SubItems [1].Text;
                    this.lVw .Items [i].SubItems [1].Text =t;
                }
            }