Row Transposition cipher - encryption-decryption Csharp(C#)

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

namespace Row_transposition
{
    public partial class Form1 : Form
    {
        static int x1 = -266;
        string key="";
        string plaintxt="";
        string ciphertxt="";
        string pureplaintxt="";
        string purekey="";
        int[] intKey;
        int indexofmin;
        int matrixRow, matrixColumn;
        int index = 0;
        string[,] matirxLetter;
        public Form1()
        {
            InitializeComponent();
        }
                /*/////////////////////////////////////////*/
                // initialize the variables
        public void initialize()
        {
            key = "";
            plaintxt = "";
            ciphertxt = "";
            pureplaintxt = "";
            purekey = "";
            index = 0;
        }
        
                /*/////////////////////////////////////////*/
                // fill matrix with spaces
        public void fillMatrix()
        {
            for (int i = 0; i < matrixRow; i++)
            {
                for (int j = 0; j < matrixColumn; j++)
                {
                    matirxLetter[i, j] = " ";
                }
            }
        }
               /*/////////////////////////////////////////*/
               // remove spaces from key and plain text
        public string removespaces(string var)
        {
            string purevar = "";
            for (int i = 0; i < var.Length; i++)
            {
                if (var.Substring(i, 1) != " ")
                {
                    purevar += var.Substring(i, 1);
                }
            }
            return purevar;
        }   
                    /*/////////////////////////////////////////*/
                    // get the index of the minimum number in key
        public int getIndexOfMin(int min)
        {
            int indexMin = 0;
            for (int j = 0; j < intKey.Length; j++)
            {
                if (min == intKey[j])
                {
                    indexMin = j;
                }
            }
            return indexMin;
        }
                  /*/////////////////////////////////////////*/
                  // get the index of the minimum number in key
        public int getIndexOfMin()
        {
            int min = 100;
            int indexMin = 0;
            for (int j = 0; j < intKey.Length; j++)
            {
                if (min > intKey[j])
                {
                    min = intKey[j];
                    indexMin = j;
                }
            }
            return indexMin;
        }
                     /*//////////////////////////////////////////*/
        public int getMin()
        {
            int min=100;
            for (int j = 0; j < intKey.Length; j++)
            {
                if (min > intKey[j])
                {
                    min = intKey[j];
                }
            }
            return min;
        }
                    /*//////////////////////////////////////////*/
                    // encrypte the plain text
        public void encrypte()
        {
            intKey = new int[purekey.Length];

            for (int i = 0; i < purekey.Length; i++)
            {
                intKey[i] = int.Parse(purekey.Substring(i, 1));
            }
            for (int k = 0; k < intKey.Length; k++)
            {
                indexofmin = getIndexOfMin();
                intKey[indexofmin] = 100;
                for (int x = 0; x < matrixRow; x++)
                {
                    ciphertxt += matirxLetter[x, indexofmin];
                }
            }
        }
                    /*//////////////////////////////////////////*/
                    // decrypte the cipher text
        public void decrypte()
        {
            int min;
            int position;
            intKey = new int[purekey.Length];
            for (int i = 0; i < purekey.Length; i++)
            {
                intKey[i] = int.Parse(purekey.Substring(i, 1));
            }
            for (int h = 0; h < matrixRow; h++)
            {
                position = 0;
                for (int x = 0; x < matrixColumn; x++)
                {
                    min = getMin() + position;
                    indexofmin = getIndexOfMin(min);
                    plaintxt += matirxLetter[h, indexofmin];
                    position++;
                }
            }
        }
                 /*//////////////////////////////////////////*/
        private void encrypteToolStripMenuItem_Click(object sender, EventArgs e)
        {
            fillMatrix();
            textBox3.Text = "";
            key = textBox1.Text;
            plaintxt = textBox2.Text;
            purekey = removespaces(key);
            pureplaintxt = removespaces(plaintxt);
            matrixColumn = purekey.Length;
            //calculate the diminsition of the matrix letter
            if (pureplaintxt.Length % purekey.Length != 0)
            {
                matrixRow = (pureplaintxt.Length / purekey.Length) + 1;
            }
            else
            {
                matrixRow = pureplaintxt.Length / purekey.Length;
            }
            matirxLetter = new string[matrixRow, matrixColumn];
                  // fill Matrix of letter with the plain text character
            for (int i = 0; i < matrixRow; i++)
            {
                for (int j = 0; j < matrixColumn; j++)
                {
                    if (index < pureplaintxt.Length)
                    {
                        matirxLetter[i, j] = pureplaintxt.Substring(index, 1);
                        index++;
                    }
                    else
                    {
                        matirxLetter[i, j] = " ";
                    }
                }
            }
            encrypte();
            textBox3.Text = ciphertxt;
            initialize();
        }

        private void decrypteToolStripMenuItem_Click(object sender, EventArgs e)
        {
            fillMatrix();
            index = 0;
            textBox2.Text = "";
            key = textBox1.Text;
            ciphertxt = textBox3.Text;
            purekey = removespaces(key);
            matrixColumn = purekey.Length;
            //calculate the diminsition of the matrix letter
            if (ciphertxt.Length % purekey.Length != 0)
            {
                matrixRow = (ciphertxt.Length / purekey.Length) + 1;
            }
            else
            {
                matrixRow = ciphertxt.Length / purekey.Length;
            }
            matirxLetter = new string[matrixRow, matrixColumn];
                // fill Matrix of letter with the cipher text character
            for (int i = 0; i < matrixColumn; i++)
            {
                for (int j = 0; j < matrixRow; j++)
                {
                    matirxLetter[j, i] = ciphertxt.Substring(index, 1);
                    index++;
                }
            }
            decrypte();
            textBox2.Text = plaintxt;
            initialize();
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {
            if (textBox1.Text == "")
            {
                menuStrip1.Enabled = false;
            }
            else
            {
                menuStrip1.Enabled = true;
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            if (textBox1.Text == "")
            {
                menuStrip1.Enabled = false;
            }
            else
            {
                menuStrip1.Enabled = true;
            }
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            DialogResult exit;
            exit = MessageBox.Show("Are u sure ?     ","Exit",MessageBoxButtons.YesNo);
            if (exit == DialogResult.Yes)
            {
                MessageBox.Show("Thank for using my program     ","Goooood bye");
                Application.ExitThread();
            }
            else
            {
                e.Cancel = true;
            }
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            DateTime.Now.TimeOfDay.Milliseconds.ToString();
            x1 += 5;
            Point p1 = new Point(x1, 266);
            if (x1 >= 257)
            {
                x1 = -266;
                p1.X = x1;
                label4.Location = p1;

            }
            else
            {
                label4.Location = p1;
            }
        }
    }
}

using System;
using System.Collections.Generic;
using System.Windows.Forms;

namespace Row_transposition
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
        }
    }
}

namespace Row_transposition
{
    partial class Form1
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.components = new System.ComponentModel.Container();
            this.menuStrip1 = new System.Windows.Forms.MenuStrip();
            this.encrypteToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
            this.decrypteToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
            this.label1 = new System.Windows.Forms.Label();
            this.textBox1 = new System.Windows.Forms.TextBox();
            this.label2 = new System.Windows.Forms.Label();
            this.textBox2 = new System.Windows.Forms.TextBox();
            this.label3 = new System.Windows.Forms.Label();
            this.textBox3 = new System.Windows.Forms.TextBox();
            this.timer1 = new System.Windows.Forms.Timer(this.components);
            this.label4 = new System.Windows.Forms.Label();
            this.menuStrip1.SuspendLayout();
            this.SuspendLayout();
            // 
            // menuStrip1
            // 
            this.menuStrip1.BackColor = System.Drawing.SystemColors.Control;
            this.menuStrip1.GripStyle = System.Windows.Forms.ToolStripGripStyle.Visible;
            this.menuStrip1.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {
            this.encrypteToolStripMenuItem,
            this.decrypteToolStripMenuItem});
            this.menuStrip1.Location = new System.Drawing.Point(0, 0);
            this.menuStrip1.Name = "menuStrip1";
            this.menuStrip1.RenderMode = System.Windows.Forms.ToolStripRenderMode.System;
            this.menuStrip1.Size = new System.Drawing.Size(292, 24);
            this.menuStrip1.TabIndex = 0;
            this.menuStrip1.Text = "menuStrip1";
            // 
            // encrypteToolStripMenuItem
            // 
            this.encrypteToolStripMenuItem.Name = "encrypteToolStripMenuItem";
            this.encrypteToolStripMenuItem.Size = new System.Drawing.Size(62, 20);
            this.encrypteToolStripMenuItem.Text = "Encrypte";
            this.encrypteToolStripMenuItem.Click += new System.EventHandler(this.encrypteToolStripMenuItem_Click);
            // 
            // decrypteToolStripMenuItem
            // 
            this.decrypteToolStripMenuItem.Name = "decrypteToolStripMenuItem";
            this.decrypteToolStripMenuItem.Size = new System.Drawing.Size(63, 20);
            this.decrypteToolStripMenuItem.Text = "Decrypte";
            this.decrypteToolStripMenuItem.Click += new System.EventHandler(this.decrypteToolStripMenuItem_Click);
            // 
            // label1
            // 
            this.label1.AutoSize = true;
            this.label1.Location = new System.Drawing.Point(12, 45);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(35, 13);
            this.label1.TabIndex = 1;
            this.label1.Text = "Key  :";
            // 
            // textBox1
            // 
            this.textBox1.Location = new System.Drawing.Point(88, 42);
            this.textBox1.Name = "textBox1";
            this.textBox1.Size = new System.Drawing.Size(183, 20);
            this.textBox1.TabIndex = 2;
            this.textBox1.TextChanged += new System.EventHandler(this.textBox1_TextChanged);
            // 
            // label2
            // 
            this.label2.AutoSize = true;
            this.label2.Location = new System.Drawing.Point(12, 85);
            this.label2.Name = "label2";
            this.label2.Size = new System.Drawing.Size(65, 13);
            this.label2.TabIndex = 3;
            this.label2.Text = "Plain text  : ";
            // 
            // textBox2
            // 
            this.textBox2.Location = new System.Drawing.Point(88, 82);
            this.textBox2.Multiline = true;
            this.textBox2.Name = "textBox2";
            this.textBox2.Size = new System.Drawing.Size(183, 69);
            this.textBox2.TabIndex = 4;
            // 
            // label3
            // 
            this.label3.AutoSize = true;
            this.label3.Location = new System.Drawing.Point(12, 173);
            this.label3.Name = "label3";
            this.label3.Size = new System.Drawing.Size(74, 13);
            this.label3.TabIndex = 5;
            this.label3.Text = "Cipher text  : ";
            // 
            // textBox3
            // 
            this.textBox3.Location = new System.Drawing.Point(88, 170);
            this.textBox3.Multiline = true;
            this.textBox3.Name = "textBox3";
            this.textBox3.Size = new System.Drawing.Size(183, 78);
            this.textBox3.TabIndex = 6;
            // 
            // timer1
            // 
            this.timer1.Enabled = true;
            this.timer1.Tick += new System.EventHandler(this.timer1_Tick);
            // 
            // label4
            // 
            this.label4.AutoSize = true;
            this.label4.ForeColor = System.Drawing.Color.Blue;
            this.label4.Location = new System.Drawing.Point(-266, 271);
            this.label4.Name = "label4";
            this.label4.Size = new System.Drawing.Size(264, 13);
            this.label4.TabIndex = 32;
            this.label4.Text = "ÇáÍãÏ ááå ÇáÐí åÏÇäÇ áåÐÇ æ ãÇ ßäÇ áäåÊÏí áæáÇ Çä åÏÇäÇ Çááå";
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(292, 293);
            this.Controls.Add(this.label4);
            this.Controls.Add(this.textBox3);
            this.Controls.Add(this.label3);
            this.Controls.Add(this.textBox2);
            this.Controls.Add(this.label2);
            this.Controls.Add(this.textBox1);
            this.Controls.Add(this.label1);
            this.Controls.Add(this.menuStrip1);
            this.ForeColor = System.Drawing.Color.Blue;
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
            this.MainMenuStrip = this.menuStrip1;
            this.MaximizeBox = false;
            this.Name = "Form1";
            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
            this.Text = "Row Transposition";
            this.FormClosing += new System.Windows.Forms.FormClosingEventHandler(this.Form1_FormClosing);
            this.Load += new System.EventHandler(this.Form1_Load);
            this.menuStrip1.ResumeLayout(false);
            this.menuStrip1.PerformLayout();
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        #endregion

        private System.Windows.Forms.MenuStrip menuStrip1;
        private System.Windows.Forms.ToolStripMenuItem encrypteToolStripMenuItem;
        private System.Windows.Forms.ToolStripMenuItem decrypteToolStripMenuItem;
        private System.Windows.Forms.Label label1;
        private System.Windows.Forms.TextBox textBox1;
        private System.Windows.Forms.Label label2;
        private System.Windows.Forms.TextBox textBox2;
        private System.Windows.Forms.Label label3;
        private System.Windows.Forms.TextBox textBox3;
        private System.Windows.Forms.Timer timer1;
        private System.Windows.Forms.Label label4;
    }
}