System.Data.SqlClient.SqlException: 'Incorrect syntax near 'Schools'.'

sda.Fill(dt);



        SqlConnection con = new SqlConnection(@"Dont want to show my sql connection but it works -lol");
        SqlDataAdapter sda = new SqlDataAdapter(selectCommandText: "Select Count (*) lFrom Schools where Username='" + textBox1.Text + "' and Password='" + textBox2.Text + "' and Security='" + textBox3.Text + "' and SecurityQuestion='" + dropDown.selectedValue + "'", selectConnection: con);
        DataTable dt = new DataTable();
        sda.Fill(dt);
        if (dt.Rows[0][0].ToString() == "1")
        {

            this.Hide();

            Form1 ss = new Form1();
            ss.Show();
        }
        else
        {
            MessageBox.Show("Your Username Or Password Is Incorrect Please Try Again");
        }
    }