using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; namespace Item_Qty_Rate_Total { public partial class Form1 : Form { int r; // Row index variable public Form1() { InitializeComponent(); r = 0; // Initialize row index } private void button1_Click(object sender, EventArgs e) { // Adding a new row to DataGridView dataGridView1.Rows.Add(); // Assign values from TextBoxes to DataGridView cells dataGridView1[0, r].Value = textBox1.Text; // Item Name dataGridView1[1, r].Value = textBox2.Text; // Quantity dataGridView1[2, r].Value = textBox3.Text; // Rate // Calculate Total (Quantity * Rate) textBox4.Text = (Convert.ToDouble(textBox3.Text) * Convert.ToDouble(textBox2.Text)).ToString(); // Assign total to DataGridView dataGridView1[3, r].Value = textBox4.Text; // Move to next row index r++; } } }