Удаление элементов массива относительно главной диагонали - C#

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 WindowsFormsApplication4
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        static object[,] array;
 
        private void label1_Click(object sender, EventArgs e)
        {
 
        }
 
        private void buttonForm_Click(object sender, EventArgs e)
        {
            try
            {
                dataGridView1.RowCount = int.Parse(textBox1.Text);
                dataGridView1.ColumnCount = int.Parse(textBox1.Text);
 
                array = new object[dataGridView1.RowCount, dataGridView1.ColumnCount];
 
                dataGridView1.Visible = true;
                buttonRez.Visible = true;
 
                for (int i = 0; i < dataGridView1.RowCount; i++)
                {
                    for (int j = 0; j < dataGridView1.ColumnCount; j++)
                    {
                        if (i % 2 == 0) array[i, j] = 1;
                        else array[i, j] = 0;
                    }
                }
                for (int i = 0; i < dataGridView1.RowCount; ++i)
                    for (int j = 0; j < dataGridView1.ColumnCount; ++j)
                        dataGridView1.Rows[i].Cells[j].Value = array[i, j];
                buttonRez.Enabled = true;
 
            }
 
            catch (Exception ex)
            {
 
                MessageBox.Show(ex.Message);
            }
        }
 
        private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
 
        }
 
        private void buttonRez_Click(object sender, EventArgs e)
        {
            try
            {
 
                dataGridView2.ColumnCount = 0;
 
                dataGridView2.RowCount = int.Parse(textBox1.Text);
                dataGridView2.ColumnCount = int.Parse(textBox1.Text);
 
                dataGridView2.Visible = true;
 
                for (int i = 0; i < dataGridView2.RowCount; i++)
                {
                    for (int j = i + 1; j < dataGridView2.ColumnCount; j++)
                    {
 
                        if (((int)array[i, j]) == 0) array[i, j] = " ";
 
                    }
                }
                for (int i = 1; i < dataGridView2.RowCount; i++)
                {
                    for (int j = 0; j < i; j++)
                    {
                        if ((int)array[i, j] == 1) array[i, j] = " ";
                    }
                }
 
                for (int i = 0; i < dataGridView2.RowCount; ++i)
                    for (int j = 0; j < dataGridView2.ColumnCount; ++j)
                        dataGridView2.Rows[i].Cells[j].Value = array[i, j];
 
                buttonRez.Enabled = false;
            }
 
            catch (Exception ex)
            {
 
                MessageBox.Show(ex.Message);
            }
        }
 
        private void label2_Click(object sender, EventArgs e)
        {
 
        }
 
        private void button3_Click(object sender, EventArgs e)
        {
 
        }
 
        private void label3_Click(object sender, EventArgs e)
        {
 
        }
 
        private void textBox1_TextChanged(object sender, EventArgs e)
        {
 
        }
 
        private void Form1_Load(object sender, EventArgs e)
        {
 
        }
 
        private void buttonForm_Click_1(object sender, EventArgs e)
        {
 
        }
    }
}