BODMAS rule using asp.net

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Introduction: Hello everybody, in this article i will explain that how we can solve any mathamatic equation using BODMAS  rule using asp.net. This is very helpful artucle for the asp.net deveploer.

Implementation: Create a page named bodmas_rule.aspx page in your root folder. download NCalc - Binaries file from the above below link
http://ncalc.codeplex.com/releases/view/69050
create a bin folder in the root of your directory and place the NCalc.dll file. Place a label from the toolbox and set its id as lbl_msg. below I am giving code for .aspx page as well as .aspx.cs page . copy this code and paste it into your website and enjoy your code.
Code for .aspx page:

<div>
     <br />
        <asp:Label ID="lbl_check_answer" runat="server" Text="" Visible="false"></asp:Label>
        <asp:Button ID="btn_addition" runat="server" onclick="btn_addition_Click"
            Text="Addition" CausesValidation="False" />
        <br />
      
        <asp:Label ID="lbl_msg" runat="server" Visible="false"></asp:Label>
        <asp:Label ID="lblRandomEquation" runat="server" Text=""></asp:Label>
        <br />        <asp:TextBox ID="txt_answer" runat="server"></asp:TextBox>
       <%--<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server"
            ControlToValidate="txt_answer" ErrorMessage="Enter only numbers"
            ValidationExpression="[-+]?[0-9]+"></asp:RegularExpressionValidator>--%>
        <br />
         <asp:Button ID="Button1" runat="server" Text="Click" onclick="Button1_Click" />
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        <asp:Button ID="btn_next_question" runat="server"
            onclick="btn_next_question_Click" Text="See next Question" Visible="False"
            CausesValidation="False" />
        <br />
        <asp:Label ID="lbl_answe" runat="server"  Visible="False"></asp:Label>
    </div>
Code for aspx.cs page:
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
using System.Text;

public partial class bodmas_latest : System.Web.UI.Page
{
    SqlCommand cmd;
    SqlConnection con = new SqlConnection();
    protected void Page_Load(object sender, EventArgs e)
    {
       // here  i am creationg the connection
        con.ConnectionString = ConfigurationManager.ConnectionStrings["cn"].ConnectionString;
        con.Open();

        if (con.State == ConnectionState.Closed)
        { con.Open(); }

        con.Close();
        if (Page.IsPostBack == false)
        {

        }

    }
    protected void btn_addition_Click(object sender, EventArgs e)
    {
        // in the session starting_time m storing the starting time when the question is generated
        Session["starting_time"] = "";
        Session["starting_time"] = DateTime.Now;
        Insert_user();
        method_bodmas(Convert.ToInt32(lbl_msg.Text));
        // Create a page named bodmas_rule.aspx in the root of your folder
        //http://ncalc.codeplex.com/releases/view/69050
        // download NCalc - Binaries file from the above below link
        // create a bin folder in the root of your directory and place the NCalc.dll file
        // inside the bin folder. after placing the NCalc.dll file NCalc.Expression  in the
        // help
        // here i am giving the equation which will solved by the BODMAS rule
        // inside the object e1
        //NCalc.Expression e1 = new NCalc.Expression("(13*3)+(39*2)-7");
        //NCalc.Expression e1 = new NCalc.Expression("(15*10)-17+23*(9-3)");
        NCalc.Expression e1 = new NCalc.Expression(lblRandomEquation.Text);
        ViewState["correct_answer"] = (e1.Evaluate().ToString());
        ViewState["question"] = lblRandomEquation.Text;
        lbl_check_answer.Text = ViewState["correct_answer"].ToString();
       
        btn_next_question.Visible = false;
        txt_answer.Enabled = true;
        lbl_answe.Text = "";

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        if (txt_answer.Text == "")
        {
            lbl_answe.Visible = true;
            lbl_answe.Text = "Type Your Answer Please";

        }
        else
        {
            // here m compairing the the answer entered by the user and 
            // the correct answer. if the both answer r same
            // then it goes inside the if
            // otherwise it will go inside the else
// and both answer will stored inside the table
            // if wrong or if correct
            if (Convert.ToInt32(ViewState["correct_answer"]) == Convert.ToInt32(txt_answer.Text))
            {
                if (con.State == ConnectionState.Closed)
                { con.Open(); }
                cmd = new SqlCommand();
                cmd.CommandText = @"INSERT INTO  tb_bodmas
                          VALUES(@question,@correct_answer,
                          @your_answer,@username,@starting_time,
                          @ending_time)";
                cmd.Connection = con;
                cmd.Parameters.AddWithValue("@question", ViewState["question"].ToString());
                cmd.Parameters.AddWithValue("@correct_answer", Convert.ToInt32(ViewState["correct_answer"]));
                cmd.Parameters.AddWithValue("@your_answer", txt_answer.Text);
                cmd.Parameters.AddWithValue("@username", string.Empty);
                cmd.Parameters.AddWithValue("@starting_time", Convert.ToDateTime(Session["starting_time"]));
                cmd.Parameters.AddWithValue("@ending_time", DateTime.Now);
                cmd.ExecuteNonQuery();
                cmd.Dispose();
                con.Close();
                lbl_answe.Visible = true;
                lbl_answe.Text = "correct";
                btn_next_question.Visible = true;
                txt_answer.Text = "";
                txt_answer.Enabled = false;

            }
            else
            {
                if (con.State == ConnectionState.Closed)
                { con.Open(); }
                cmd = new SqlCommand();
                cmd.CommandText = @"INSERT INTO  tb_bodmas
                          VALUES(@question,@correct_answer,
                          @your_answer,@username,@starting_time,@ending_time)";
                cmd.Connection = con;
                cmd.Parameters.AddWithValue("@question", ViewState["question"].ToString());
                cmd.Parameters.AddWithValue("@correct_answer", Convert.ToInt32(ViewState["correct_answer"]));
                cmd.Parameters.AddWithValue("@your_answer", txt_answer.Text);
                cmd.Parameters.AddWithValue("@username", string.Empty);
                cmd.Parameters.AddWithValue("@starting_time", Convert.ToDateTime(Session["starting_time"]));
                cmd.Parameters.AddWithValue("@ending_time", DateTime.Now);
                cmd.ExecuteNonQuery();
                cmd.Dispose();
                con.Close();
                lbl_answe.Visible = true;
                lbl_answe.Text = "Incorrect";
                txt_answer.Text = "";
                Session["starting_time"] = string.Empty;
                Session["starting_time"] = DateTime.Now;
            }
        }

    }
    protected void btn_next_question_Click(object sender, EventArgs e)
    {
        // in the session starting_time m storing the starting time when the question is generated
        Session["starting_time"] = "";
        Session["starting_time"] = DateTime.Now;
        Insert_user();
        method_bodmas(Convert.ToInt32(lbl_msg.Text));
        //NCalc.Expression e1 = new NCalc.Expression("(15*10)-17+23*(9-3)");
        //in The next i am passing the equation to the e1 object then
        // this equation will be solve by the method.
        NCalc.Expression e1 = new NCalc.Expression(lblRandomEquation.Text);
        // here m storing the correct answer vin the viewstate because when user enter their answer
        // then i'll compare this answer to the viewstate's value
        // if these values are equal then lbl_answe.Text shows the answer is correct and
        // if not then it shows the answer is incorrect
        ViewState["correct_answer"] = (e1.Evaluate().ToString());
        ViewState["question"] = lblRandomEquation.Text;
        lbl_check_answer.Text = ViewState["correct_answer"].ToString();
        btn_next_question.Visible = false;
        txt_answer.Enabled = true;
        lbl_answe.Text = "";
   


    }

    public void method_bodmas(int n)
    {
        // this function will generate the equation for the Bodmas
        //i am passing int n value  from the lbl_mgs.text inseide the Insert_use function
        StringBuilder equationBuilder = new StringBuilder();
        Random rnd = new Random();
        char[] operators = new char[] { '+', '-', '*', '/' };
        bool isBraces = rnd.Next(0, 2) == 1 ? true : false;
        bool isBracesOpened = false;
        int rndBracesLocation = rnd.Next(0, n - 1);

        int[] nums = new int[n];

        for (int i = 0; i < n; i++)
        {
            nums[i] = rnd.Next(1, 9);
        }

        char[] appOperator = new char[n - 1];


        for (int j = 0; j < n - 1; j++)
        {
            appOperator[j] = operators[rnd.Next(0, 3)];
        }

        for (int i = 0; i < n - 1; i++)
        {
            if ((isBraces && i == rndBracesLocation) || (isBracesOpened))
            {
                if (isBracesOpened)
                {
                    equationBuilder.Append(nums[i]);
                    equationBuilder.Append(")");
                    equationBuilder.Append(appOperator[i]);
                    isBracesOpened = false;
                }
                else
                {
                    equationBuilder.Append("(");
                    equationBuilder.Append(nums[i]);
                    equationBuilder.Append(appOperator[i]);
                    isBracesOpened = true;
                }

                isBraces = false;
            }
            else
            {
                equationBuilder.Append(nums[i]);
                equationBuilder.Append(appOperator[i]);
            }
        }
        equationBuilder.Append(nums[n - 1]);

        string equ = equationBuilder.ToString();
        if (equ.Contains("(") && !equ.Contains(")"))
            equ += ")";
        lblRandomEquation.Text = equ;





    }
    // This function will generate the value from 4 to 5
    // this function will decides that how many digits will come
    // inside the BODMAS equation
    public String recieptno(string rec)
    {

        int i = 0;
        int j = 0;
        int r = 0;

        Random ran = null;

        string str = null;

        str = "";

        ran = new Random();

        i = ran.Next(1, 1);

        for (j = 1; j <= i; j++)
        {
            r = ran.Next(4, 9);


            if (r < 65)
            {
            }

            str = str + r;
          

        }



        string recc = str;
        return recc;






    }
    private void Insert_user()
    {
        // the generated value will store inside the UID and after this lbl_msg
        string rec1 = "";
        string UID = recieptno(rec1);
        lbl_msg.Text = UID;
        //value wil be returned here


    }
}

Conclusion
Through this article, you have learned how to solve any equation using BODMAS rule. If you have any suggestion to improve this article then send mail me at bharti222000@yahoo.com.
Thanks



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