converting from integer to double

hi,

as per my knowledge if you want to result in decimal so all your variable are in to decimal.

for example...
int i=4;
double p = 200.45;

var result = p/i;
so in this case result is int and value is 50.

but same thing
var result = p/(double)i;

so result is double and value is 50.1125
hope you understand.

this is my full code

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;


namespace CgpaCalculator
{
    public partial class Infopage : Form
    {
        public Infopage()
        {
            InitializeComponent();
        }
     private void Form1_Load(object sender, EventArgs e)
        {
            level.Items.Add("100.");
            level.Items.Add("200.");
            level.Items.Add("300.");
            level.Items.Add("400.");
            level.Items.Add("500.");
            level.Items.Add("600.");
            level.Focus();

            modeofentry.Items.Add("D.E.");
            modeofentry.Items.Add("U.T.M.E.");
            modeofentry.Focus();
        // datagridview combo box
            crspnt.Items.Add("0");
            crspnt.Items.Add("1");
            crspnt.Items.Add("2");
            crspnt.Items.Add("3");
            crspnt.Items.Add("4");
            crspnt.Items.Add("5");
            crspnt.Items.Add("6");
            crspnt.Items.Add("7");   
         }

        private void save_Click(object sender, EventArgs e)
        {
            int sumunt = 0;
            for (int i = 0; i < dataGridView1.Rows.Count; ++i)
            {
                sumunt += Convert.ToInt32(dataGridView1.Rows[i].Cells["crsunt"].Value);
            }
           totcrsunt.Text = sumunt.ToString();


           int sumgp = 0;
           for (int i = 0; i < dataGridView1.Rows.Count; ++i)
           {
               sumgp += Convert.ToInt32(dataGridView1.Rows[i].Cells["crsgp"].Value);
           }
           totcrsgp.Text = sumgp.ToString();

           int grpnt = Convert.ToInt32(totcrsgp.Text);
           int unit = Convert.ToInt32(totcrsunt.Text);
           int cgpa = grpnt % unit;
           mycgpa.Text = cgpa.ToString();
          
        }
      
        private void dataGridView1_CellEndEdit_1(object sender, DataGridViewCellEventArgs e)
        {
            int crsunt = Convert.ToInt32(dataGridView1.CurrentRow.Cells[1].Value);
            int crspnt = Convert.ToInt32(dataGridView1.CurrentRow.Cells[3].Value);
            int crsgp = crspnt * crsunt;
            dataGridView1.CurrentRow.Cells[4].Value = crsgp;


        }
    }
}

Can u share your full code..

Try:


 int grpnt = Convert.ToInt32(totcrsgp.Text);
 int unit = Convert.ToInt32(totcrsunt.Text);
 int cgpa = grpnt % unit;
 mycgpa.Text = cgpa.ToString();

or you could replace all that with:

 int cgpa = sumgp % sumunt;
 mycgpa.Text = cgpa.ToString();

I've tried the two method but I'm getting an exception error
Unable to cast object of type 'System.Windows.Forms.TextBox' to type 'system.IConvertible'.

try this;

int cgpa = grpnt / unit;
mycgpa.Text = Convert.ToString(cgpa);

hi
give like this
int cgpa =convert.ToInt32(grpnt % unit);