asp.net实现分页效果

public void PagerButtonClick(Object sender, CommandEventArgs e)
{
btnFirst.Enabled=true;
btnPrev.Enabled=true;
btnNext.Enabled=true;
btnLast.Enabled=true;

//由外部分页 UI 使用
String arg = e.CommandArgument.ToString();

PageCount=Int32.Parse(lblPageCount.Text.ToString());
int pageindex=Int32.Parse(lblCurrentPage.Text.ToString())-1;

switch(arg)
{
case "Next":
if (pageindex < (PageCount - 1))
pageindex ++;
break;
case "Prev":
if (pageindex > 0)
pageindex --;
break;
case "Last":
pageindex = (PageCount - 1);
break;
case "First":
pageindex=0;
break;
}
if(pageindex==0)
{
btnFirst.Enabled=false;
btnPrev.Enabled=false;
}
else if(pageindex==PageCount-1)
{
btnLast.Enabled=false;
btnNext.Enabled=false;
}
MyList.CurrentPageIndex=pageindex;
dataBind();
lblCurrentPage.Text=(MyList.CurrentPageIndex+1).ToString();

}

private void txtIndex_TextChanged_1(object sender, System.EventArgs e)
{
btnFirst.Enabled=true;
btnPrev.Enabled=true;
btnNext.Enabled=true;
btnLast.Enabled=true;

int index=Int32.Parse(txtIndex.Text.ToString());
PageCount=Int32.Parse(lblPageCount.Text.ToString());
if(index>=1&&index<=PageCount)
{
MyList.CurrentPageIndex=index-1;
DataBind();
lblCurrentPage.Text=index.ToString();

if(index==1)
{
btnFirst.Enabled=false;
btnPrev.Enabled=false;
}
else if(index==PageCount)
{
btnLast.Enabled=false;
btnNext.Enabled=false;
}

else

{ txtIndex.Text=""; }
dataBind();
}
}