Server Error in '/HMS' Application.

SQL Server does not exist or access denied.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Data.SqlClient.SqlException: SQL Server does not exist or access denied.

Source Error:

Line 57: 			//连接本地计算机的HMS数据库
Line 58: 			SqlConnection cn= new SqlConnection (strconn);
Line 59: 			cn.Open ();
Line 60: 			//构造SQL语句，该语句在Users表中检查用户名和密码是否正确
Line 61: 			string mysql= "select * from Users where Uid='"+tbx_uid.Text +"'and UPassword='"+tbx_upassword.Text +"'";

Source File: C:\Inetpub\wwwroot\HMS\Default.aspx.cs Line: 59

Stack Trace:

[SqlException: SQL Server does not exist or access denied.]
   System.Data.SqlClient.ConnectionPool.GetConnection(Boolean& isInTransaction) +484
   System.Data.SqlClient.SqlConnectionPoolManager.GetPooledConnection(SqlConnectionString options, Boolean& isInTransaction) +372
   System.Data.SqlClient.SqlConnection.Open() +384
   WMS._Default.btn_login_Click(Object sender, EventArgs e) in C:\Inetpub\wwwroot\HMS\Default.aspx.cs:59
   System.Web.UI.WebControls.Button.OnClick(EventArgs e) +108
   System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +57
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +18
   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33
   System.Web.UI.Page.ProcessRequestMain() +1277

Version Information: Microsoft .NET Framework Version:1.1.4322.573; ASP.NET Version:1.1.4322.573
应该怎么办呢？

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