我知道是字符串的连接，其中 typeid是我的一个已定义的字符，但是我没能理解具体意思！！！

整个程序是这样的，是两个表，但是红色的我不是很明白，大家帮忙讲解一下。谢谢！

connstring = System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"];

SqlConnection conn = new SqlConnection(connstring);

string sqltype="select typeid from newstype where parentid=3";

satype = new SqlDataAdapter(sqltype,conn);

satype.Fill(ds,"newstype");

if(!Page.IsPostBack)

{

int counttype;

counttype=ds.Tables["newstype"].Rows.Count;

int i;

int typeid;

string typelist="";

if(counttype!=0)

for (i=0;i<=counttype-1;i++)

{

typeid=(int)ds.Tables["newstype"].Rows[0]["typeid"];

typelist+="typeid=" + typeid + " or ";

}

typelist=typelist.Remove (typelist.Length -4,4);

string sql="select top 6 id,title,time from newsreport where inuse='1' and " + typelist +" order by time desc";

sa = new SqlDataAdapter(sql,conn);

sa.Fill(ds,"newsreport");

string title="";

int count;

int id;

string t="";

count=ds.Tables["newsreport"].Rows.Count;

int j;

if(count!=0)

{

for(j=0;j<=count-1;j++)

{

title=ds.Tables["newsreport"].Rows[j]["title"].ToString().Trim();

t=ds.Tables["newsreport"].Rows[j]["time"].ToString().Trim();

string time=t.Substring(0,9);

id=(int)ds.Tables["newsreport"].Rows[j]["id"];

Literal1.Text +="<img src='images/arrow-blue.gif' width='8' height='9' align='absmiddle'> <a href='/Normal/news/readnews.asp?id="+ id +"' target='_blank'>"+ title +"("+ time +")</a><br>";

}

}

}

}

typelist=typelist.Remove (typelist.Length -4,4);

string sql="select top 6 id,title,time from newsreport where inuse='1' and " + typelist +" order by time desc";