Program to find the sum of two 2D matrices.. Each element of the matrix to be entered by the user using textbox.

Program to find the sum of two 2D matrices.. Each element of the matrix to be entered by the user using textbox.

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 Two_D_Array
{
public partial class Form1 : Form
{
int row, col;// size of first array
int row1, col1; // size of second array
int i = 0, j = 0;
int k = 0, l = 0;
int m = 0, n = 0;
int[,] a;
int[,] a1;
public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{

}

private void textBox2_TextChanged(object sender, EventArgs e)
{

}

private void button2_Click(object sender, EventArgs e)
{

}

private void label4_Click(object sender, EventArgs e)
{

}

private void button4_Click(object sender, EventArgs e)
{
row1 = Convert.ToInt32(textBox7.Text);
col1 = Convert.ToInt32(textBox6.Text);
a1 = new int[row1, col1];
}

private void button3_Click(object sender, EventArgs e)
{
try
{

if (m < row1)
{
if (n < col1)
{
a1[m, n] = Convert.ToInt32(textBox5.Text);
textBox5.Text = "";
listBox2.Items.Add(a1[m, n]);
textBox8.Text += a1[m, n].ToString() + "\t";
n++;

}
else
{
m++;
n = 0;
textBox8.Text += "\n";
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}

private void button2_Click_1(object sender, EventArgs e)
{
try
{
if (i < row)
{
if (j < col)
{
a[i, j] = Convert.ToInt32(textBox3.Text);
textBox3.Text = "";
listBox1.Items.Add(a[i, j]);
textBox4.Text += a[i, j].ToString() + "\t";
j++;

}
else
{
i++;
j = 0;
textBox4.Text += "\n";
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}

private void button1_Click_1(object sender, EventArgs e)
{
row = Convert.ToInt32(textBox1.Text);
col = Convert.ToInt32(textBox2.Text);
a = new int[row, col];
//MessageBox.Show("size is set");

}

private void textBox9_TextChanged(object sender, EventArgs e)
{

}

private void button5_Click(object sender, EventArgs e)
{
try
{
int[,] sum = new int[row, col];
if (row == row1 && col == col1)
{
if (k < row)
{
if (l < col)
{

sum[k, l] = a[k, l] + a1[k, l];
textBox9.Text += sum[k, l].ToString() + "\t";
l++;

}
else
{
k++;
l = 0;
textBox9.Text += "\n";
}
}
}

}

catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}

}

}
}