SqlDataReader可以再放一个SqlDataReader吗

SqlConnection con = DBClass.GetCon();
con.Open();

string sql = "select * from project";
SqlDataReader drprojectid = Help.GetSqlReader(sql,con);
try
{
while (drprojectid.Read())
{
result = bool.Parse(drprojectid["isMulti"].ToString());

projectid = int.Parse(drprojectid["projectid"].ToString());
int projecitid = projectid;

Literal li = new Literal();
li.Text = number + "." + drprojectid["title"].ToString() + "<br>";
PlaceHolder1.Controls.Add(li);

string sqlItem = "select * from Item where projectid='" + projectid + "'";

SqlDataReader drItem = Help.GetReader(sqlItem,con);
while (drItem.Read())

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