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ÔÚWeb.configÎļþÖÐÅäÖÃÈçÏÂ
<appSettings>
  <add key="ConnectionString" value="HG\SQLEXPRESS;database=db_09;UId=sa;password=''"/>
</appSettings>
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Òì³£ÏêϸÐÅÏ¢: System.ArgumentException: ²»Ö§³Ö¹Ø¼ü×Ö: ¡°hg\sqlexpress;database¡±¡£
Ô´´íÎó: 
ÐÐ 24: {
ÐÐ 25: string myStr = ConfigurationManager.AppSettings["ConnectionString"].ToString();
ÐÐ 26: SqlConnection myConn = new SqlConnection(myStr);
ÐÐ 27: return myConn;
ÐÐ 28: }

---

service=localhost;database=db_09;UId=sa;password=''

---

service=HG\SQLEXPRESS

---

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service=HG\SQLEXPRESS

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---

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service=HG\SQLEXPRESS

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XML code:

<add key="ConnectionString" value="Data Source=HG\SQLEXPRESS;database=db_09;UId=sa;password=''"/>


or
XML code:

<add key="ConnectionString" value="Server=HG\SQLEX