我这个是数据库问题吗?

Server Error in '/lianxi' Application.
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用户 'sa' 登录失败。原因: 未与信任 SQL Server 连接相关联。
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: 用户 'sa' 登录失败。原因: 未与信任 SQL Server 连接相关联。

Source Error:

Line 17: {
Line 18: string sqlstr = "select * from message";
Line 19: myconn.Open();
Line 20: SqlDataAdapter da = new SqlDataAdapter(sqlstr, myconn);
Line 21: DataSet ds = new DataSet();

Source File: d:\soft\Project\lianxi\Default.aspx.cs Line: 19