Add Rows into DataGridView without Repeatation of same row in C# Project

Source Code Helpful?

That's project is helpful for those students that's wants to develop / create your on project in C# window form that has totally professional level development criteria.
That's source code has following control functions:

• Add values into dataGridView control

• Calculations in dataGridView Control

• Update same row without repeat that row again

• Add multi-pal record into dataGridView

• Debug Source Code for Result Test

• Use of for loop

That is helpful when we create a invoice in sale system

Watch Video For Debugging the source code 

Source 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;

namespace DGVDemoAddRows
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //Add row when datagridview is empty
            if (dataGridView1.Rows.Count == 0)
            {
                int n= dataGridView1.Rows.Add();
                dataGridView1.Rows[n].Cells[0].Value = txtId.Text;
                dataGridView1.Rows[n].Cells[1].Value = comboBox1.Text;
                dataGridView1.Rows[n].Cells[2].Value = txtPrice.Text;
                dataGridView1.Rows[n].Cells[3].Value = txtQty.Text;
                dataGridView1.Rows[n].Cells[4].Value = Convert.ToDecimal(txtPrice.Text) * Convert.ToDecimal(txtQty.Text);
                return;
            }

            //update existing row value
            for (int i = 0; i <= dataGridView1.Rows.Count - 1; i++)
            {
                if (dataGridView1.Rows[i].Cells[0].Value.ToString() == txtId.Text.Trim()) //column1=Id
                {
                    //int n = dataGridView1.Rows.Add();
                    dataGridView1.Rows[i].Cells[0].Value = txtId.Text;
                    dataGridView1.Rows[i].Cells[1].Value = comboBox1.Text;
                    dataGridView1.Rows[i].Cells[2].Value = txtPrice.Text;
                    decimal qty = Convert.ToDecimal(dataGridView1.Rows[i].Cells[3].Value) + Convert.ToDecimal(txtQty.Text);
                    dataGridView1.Rows[i].Cells[3].Value = qty.ToString();
                    dataGridView1.Rows[i].Cells[4].Value = Convert.ToDecimal(txtPrice.Text) * Convert.ToDecimal(qty);
                    return;
                }
            }

            //add row when rows already present
            int a = dataGridView1.Rows.Add();
            dataGridView1.Rows[a].Cells[0].Value = txtId.Text;
            dataGridView1.Rows[a].Cells[1].Value = comboBox1.Text;
            dataGridView1.Rows[a].Cells[2].Value = txtPrice.Text;
            dataGridView1.Rows[a].Cells[3].Value = txtQty.Text;
            dataGridView1.Rows[a].Cells[4].Value = Convert.ToDecimal(txtPrice.Text) * Convert.ToDecimal(txtQty.Text);
            return;
        }
    }
}