Created a login form with a local SQL database, upon execution and after a login attempt an "ArgumentException Unhandled" error occurs

I understand the same thing has been asked before and closed due to a simple typo. From what I can see I don't have any typos and I've tried to figure out the problem by Googling but no luck.

I have created this Login Window. Main Login Window

I have created a local SQL Database from within Visual Studio (2015) to store my users. To establish the connection to this database I have written this line of code in my Enter button that is visible in the Main Login Window.

SqlConnection sqlConn = new SqlConnection(@"Data Source=(LocalDB)\MSSQLLocalDB;Initial Catalog=C: \USERS\NIKOS\DESKTOP\NIKOS();\SAFE BOX\DATABASE\SAFEBOXDB.MDF;Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=True;ApplicationIntent=ReadWrite;MultiSubnetFailover=False");

This path has been pasted by right clicking my database and selecting properties. In the properties there is a field named Connection String. That's what I have copied and pasted, into the above path in the code.

This is all my code.

        //Find path for SQL Connection
        SqlConnection sqlConn = new SqlConnection(@"Data Source=(LocalDB)\MSSQLLocalDB;Initial Catalog=C:\USERS\NIKOS\DESKTOP\NIKOS();\SAFE BOX\DATABASE\SAFEBOXDB.MDF;Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=True;ApplicationIntent=ReadWrite;MultiSubnetFailover=False");
        //Add query for actions to be taken once connection is established, select the user
        string sqlQuery = "Select * from dbo.Table Where username = '" + txtEnterUserName.Text.Trim() + "' and password = '" + txtEnterPassword.Text.Trim();
        //Add SQL Data Adapter passing in the connection and the query
        SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(sqlQuery, sqlConn);

        //Create new Datatable object
        DataTable dataTable = new DataTable();
        //Fill SQL Data Adapter with the dataTable
        sqlDataAdapter.Fill(dataTable);

        if (dataTable.Rows.Count == 1)
        {
            loginMain objFormMain = new loginMain();
            this.Hide();
            UserDashboard userDash = new UserDashboard();
            userDash.Show();
        }
        else
        {
            MessageBox.Show("Check Username and Password");
        }

When I run the program, my Main Login Window appears as it's the main window, I enter my credentials as per the table in the database and I get this error as soon as I press the "Enter" button.

ArgumentException was unhandled

I have checked and rechecked the path but I can't seem to get it working and I have no idea what the problem is. General Google searches have not helped.

Due to low reputation as I am a new user, I cannot upload my table data, I only have one row with a user name and a password. Presume these are being typed correctly.

The error says that a keyword is not supported. I can't seem to understand this.

EDIT. I have reinstalled the server and the new path is now

using (SqlConnection sqlConn = new SqlConnection(@"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=C:\Users\Nikos\Documents\SafeBox.mdf;Integrated Security=True;Connect Timeout=30"))

as per the new Connection String. So the new code for the Enter button is now

private void enterButton_Click(object sender, EventArgs e)
    {
        string sqlQuery = @"Select * from dbo.Table 
                Where username = @user AND 
                      password = @pass";
        using (SqlConnection sqlConn = new SqlConnection(@"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=C:\Users\Nikos\Documents\SafeBox.mdf;Integrated Security=True;Connect Timeout=30"))
        using (SqlCommand cmd = new SqlCommand(sqlQuery, sqlConn))
        {
            sqlConn.Open();
            cmd.Parameters.Add("@user", SqlDbType.NVarChar).Value = txtEnterUserName.Text.Trim();
            cmd.Parameters.Add("@pass", SqlDbType.NVarChar).Value = txtEnterPassword.Text.Trim();

            using (SqlDataReader reader = cmd.ExecuteReader())
            {
                if (reader.HasRows)
                {
                    loginMain objFormMain = new loginMain();
                    this.Hide();
                    UserDashboard userDash = new UserDashboard();
                    userDash.Show();
                }
                else
                {
                    MessageBox.Show("Check Username and Password");
                }
            }
        }
    }

The new error I have is {"Incorrect syntax near the keyword 'Table'."} and the error points to this line.

using (SqlDataReader reader = cmd.ExecuteReader())