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SqlDataAdapter dad4 = new SqlDataAdapter("select * from news where nid= '" + newsid + "' " ,con)
public DataRow dr;
public static string newsid;
protected void Page_Load(object sender, EventArgs e)
{
newsid = Request.Params["nid"];
if (newsid == null || newsid == "") newsid = "0"; // <----------
SqlConnection con = DB.con();
SqlDataAdapter dad4 = new SqlDataAdapter("select * from news where nid="+newsid,con);
DataSet dst = new DataSet();
dad4.Fill(dst, "aaa");
dr = dst.Tables["aaa"].Rows[0];
}