Sql连接错误或数据库表名错误

Question

调试我的程序时出错，它是一个使用asp.net c＃的Web服务登录和用户跟踪系统。 以前是sql异常错误，我已经通过更改连接字符串来修复它并且它更改为另一个错误，下面是我的代码：

[WebMethod]
public string Login(string Username, string Password)
{
    SqlConnection con = new SqlConnection(@"Data Source=.\SQLEXPRESS;Integrated Security=True;User Instance=True;");
    con.Open();
    SqlCommand cmd = new SqlCommand("SELECT Username, Password from UserData where Username = @Username AND Password = @Password ", con);
    cmd.Parameters.AddWithValue("@UserName", Username);
    cmd.Parameters.AddWithValue("@Password", Password);
    cmd.ExecuteNonQuery();
    SqlDataAdapter da = new SqlDataAdapter(cmd);
    // Create an instance of DataSet.
    DataSet ds = new DataSet();
    da.Fill(ds);
    con.Close();
    string result = "Successful";

    int count = ds.Tables[0].Rows.Count;
    if (count == 1)
    {
        SqlConnection con1 = new SqlConnection(@"Data Source=.\SQLEXPRESS;Integrated Security=True;User Instance=True;");
        con1.Open();
        DateTime dt = DateTime.Now;
        SqlCommand cmd1 = new SqlCommand("INSERT INTO ActivityLog (CreateOn, CreateBy, UpdateOn, UpdateBy) VALUES (@CreateOn,@CreateBy, @UpdateOn, @UpdateBy ", con1);
        cmd1.Parameters.AddWithValue("@CreateOn", dt);
        cmd1.Parameters.AddWithValue("@CreateBy", Username);
        cmd1.Parameters.AddWithValue("@UpdateOn", dt);
        cmd1.Parameters.AddWithValue("@UpdateBy", Username);
        cmd1.ExecuteNonQuery();
        SqlDataAdapter da1 = new SqlDataAdapter(cmd1);
        // Create an instance of DataSet.
        DataSet ds1 = new DataSet();
        da1.Fill(ds);
        con1.Close();
        return result;
    }
    else
    {
        result = "Fail";
        return result;
    }
}

这是显示的错误：

System.Data.SqlClient.SqlException: Invalid object name 'UserData'. 

我不确定是连接字符串错误还是我的代码不正确？

Answer 1

看看这个：

connectionString="Data Source=192.168.68.42\SQL2017STD;Initial Catalog=YourDBNameHere;User ID=sampleusername;Password=yourpassword; connection timeout=6000" providerName="System.Data.SqlClient"