他们唱歌时如何将UserID存储在类中？

Question

I am trying to store the UserID in a global class as the user logs in to their account however i am getting an error.

error: 'Incorrect syntax near 'UserID'. Unclosed quotation mark after the character string '0'.'

Sign in button back-end code:

 SqlDataAdapter sda = new SqlDataAdapter("SELECT * FROM tblUser WHERE Username='" + tb_LoginUsername.Text + 
                "' AND Password='" + tb_LoginPassword.Text + "'UserID='"+User.UserID , sqlConnection) ;
            /* in above line the program is selecting the whole data from table and the matching it with the user name and password provided by user. */
            DataTable dt = new DataTable(); 
            sda.Fill(dt);
            if (dt.Rows.Count > 0)
            {
               User.UserID = int.Parse(dt.Rows[0]["UserID"].ToString());

               MainWindow mainWin = new MainWindow();
               mainWin.Show();
               this.Close();
            }
            else
            {
                MessageBox.Show("Login Failed");
            }

class:

 class User
    {
        public static int UserID;
    }

Answer 1

SqlDataAdapter sda = new SqlDataAdapter("SELECT * FROM tblUser WHERE Username='" + tb_LoginUsername.Text + 
                "' AND Password='" + tb_LoginPassword.Text + "'", sqlConnection) ;
            /* in above line the program is selecting the whole data from table and the matching it with the user name and password provided by user. */
            DataTable dt = new DataTable(); 
            sda.Fill(dt);
            if (dt.Rows.Count > 0)
            {
               User.UserID = int.Parse(dt.Rows[0]["UserID"].ToString());

               MainWindow mainWin = new MainWindow();
               mainWin.Show();
               this.Close();
            }
            else
            {
                MessageBox.Show("Login Failed");
            }

removed :

"'UserID='"+User.UserID