/// <summary>
        /// Combined event handler for handling all the buttons on tool strip.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void format_Text_Click(object sender, EventArgs e)
        {
            try
            {
                ToolStripButton pressed_Btn = (ToolStripButton)sender;
                //For BOLD, ITALIC, UNDERLINE, STRIKE THROUGH.
                if (pressed_Btn == tsb_Bold || pressed_Btn == tsb_Italic || pressed_Btn == tsb_UnderLine || pressed_Btn == tsb_StrikeThrough)
                {
                    if (this.ActiveMdiChild != null)
                    {
                        Text_Viewer textView  = (Text_Viewer)this.ActiveMdiChild;
                        Font        temp_Font = textView.selected_Font_Settings;
                        if (pressed_Btn == tsb_Bold)
                        {
                            if (temp_Font.Bold)
                            {
                                FontStyle style = FontStyle.Regular;
                                if (temp_Font.Italic)
                                {
                                    style = style | FontStyle.Italic;
                                }
                                if (temp_Font.Underline)
                                {
                                    style = style | FontStyle.Underline;
                                }
                                if (temp_Font.Strikeout)
                                {
                                    style = style | FontStyle.Strikeout;
                                }



                                textView.format_Font(new Font(temp_Font.FontFamily, temp_Font.Size, style), textView.selected_BackColor, textView.selected_ForeColor);
                            }
                            else
                            {
                                textView.format_Font(new Font(temp_Font.FontFamily, temp_Font.Size, temp_Font.Style | FontStyle.Bold), textView.selected_BackColor, textView.selected_ForeColor);
                            }
                        }

                        if (pressed_Btn == tsb_Italic)
                        {
                            if (temp_Font.Italic)
                            {
                                FontStyle style = FontStyle.Regular;
                                if (temp_Font.Bold)
                                {
                                    style = style | FontStyle.Bold;
                                }
                                if (temp_Font.Underline)
                                {
                                    style = style | FontStyle.Underline;
                                }
                                if (temp_Font.Strikeout)
                                {
                                    style = style | FontStyle.Strikeout;
                                }


                                textView.format_Font(new Font(temp_Font.FontFamily, temp_Font.Size, style), textView.selected_BackColor, textView.selected_ForeColor);
                            }
                            else
                            {
                                textView.format_Font(new Font(temp_Font.FontFamily, temp_Font.Size, temp_Font.Style | FontStyle.Italic), textView.selected_BackColor, textView.selected_ForeColor);
                            }
                        }

                        if (pressed_Btn == tsb_UnderLine)
                        {
                            if (temp_Font.Underline)
                            {
                                FontStyle style = FontStyle.Regular;
                                if (temp_Font.Bold)
                                {
                                    style = style | FontStyle.Bold;
                                }
                                if (temp_Font.Italic)
                                {
                                    style = style | FontStyle.Italic;
                                }
                                if (temp_Font.Strikeout)
                                {
                                    style = style | FontStyle.Strikeout;
                                }



                                textView.format_Font(new Font(temp_Font.FontFamily, temp_Font.Size, style), textView.selected_BackColor, textView.selected_ForeColor);
                            }
                            else
                            {
                                textView.format_Font(new Font(temp_Font.FontFamily, temp_Font.Size, temp_Font.Style | FontStyle.Underline), textView.selected_BackColor, textView.selected_ForeColor);
                            }
                        }

                        if (pressed_Btn == tsb_StrikeThrough)
                        {
                            if (temp_Font.Strikeout)
                            {
                                FontStyle style = FontStyle.Regular;
                                if (temp_Font.Bold)
                                {
                                    style = style | FontStyle.Bold;
                                }
                                if (temp_Font.Underline)
                                {
                                    style = style | FontStyle.Underline;
                                }
                                if (temp_Font.Italic)
                                {
                                    style = style | FontStyle.Italic;
                                }



                                textView.format_Font(new Font(temp_Font.FontFamily, temp_Font.Size, style), textView.selected_BackColor, textView.selected_ForeColor);
                            }
                            else
                            {
                                textView.format_Font(new Font(temp_Font.FontFamily, temp_Font.Size, temp_Font.Style | FontStyle.Strikeout), textView.selected_BackColor, textView.selected_ForeColor);
                            }
                        }
                    }
                }
                else if (pressed_Btn == tsb_AlignLeft || pressed_Btn == tsb_AlignCenter || pressed_Btn == tsb_AlignRight)
                {//For ALIGN LEFT, ALIGN CENTER, ALIGN RIGHT.
                    if (this.ActiveMdiChild != null)
                    {
                        Text_Viewer text_view = (Text_Viewer)this.ActiveMdiChild;
                        text_view.format_Paragraph(pressed_Btn.Text, text_view.selected_Bullets);
                    }
                }
                else if (pressed_Btn == tsb_IncreaseIndent || pressed_Btn == tsb_DecreaseIndent)
                {//For INCREASE DECREASE INDENT.
                    if (this.ActiveMdiChild != null)
                    {
                        Text_Viewer text_view = (Text_Viewer)this.ActiveMdiChild;
                        if (pressed_Btn == tsb_IncreaseIndent)
                        {
                            text_view.increase_decrease_Indent(true);
                        }
                        else
                        {
                            text_view.increase_decrease_Indent(false);
                        }
                    }
                }
                else if (pressed_Btn == tsb_Bullet)
                {//For ENABLING/DISABLING BULLETS.
                    if (this.ActiveMdiChild != null)
                    {
                        Text_Viewer text_view = (Text_Viewer)this.ActiveMdiChild;
                        if (text_view.selected_Bullets)
                        {
                            text_view.format_Paragraph(text_view.selected_Alignment.ToString(), false);
                        }
                        else
                        {
                            text_view.format_Paragraph(text_view.selected_Alignment.ToString(), true);
                        }
                    }
                }
            }
            catch (Exception)
            {
                MessageBox.Show("Error: Cannot Handle Multiple Fonts and Size");
            }
        }
        /// <summary>
        /// Setting the Button Color and the alignment state according to formatting applied
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Set_Button_State(object sender, EventArgs e)
        {
            Button pressed_Btn = (Button)sender;

            if (pressed_Btn.Text != "I" && pressed_Btn.Text != "D")
            {
                if (pressed_Btn.Text != "Bullet")
                {
                    if (pressed_Btn.Text == "Left")
                    {
                        this.curr_Para_Aligment = "Left";
                        btn_Left.BackColor      = Color.Black;
                        btn_Left.ForeColor      = Color.White;
                        btn_Right.BackColor     = Color.LightGray;
                        btn_Right.ForeColor     = Color.Black;
                        btn_Center.BackColor    = Color.LightGray;
                        btn_Center.ForeColor    = Color.Black;
                    }
                    else if (pressed_Btn.Text == "Right")
                    {
                        this.curr_Para_Aligment = "Right";
                        btn_Left.BackColor      = Color.LightGray;
                        btn_Left.ForeColor      = Color.Black;
                        btn_Right.BackColor     = Color.Black;
                        btn_Right.ForeColor     = Color.White;
                        btn_Center.BackColor    = Color.LightGray;
                        btn_Center.ForeColor    = Color.Black;
                    }
                    else if (pressed_Btn.Text == "Center")
                    {
                        this.curr_Para_Aligment = "Center";
                        btn_Left.BackColor      = Color.LightGray;
                        btn_Left.ForeColor      = Color.Black;
                        btn_Right.BackColor     = Color.LightGray;
                        btn_Right.ForeColor     = Color.Black;
                        btn_Center.BackColor    = Color.Black;
                        btn_Center.ForeColor    = Color.White;
                    }
                }
                else
                {
                    if (this.is_Bullets_Applied)
                    {
                        btn_Bullet.BackColor    = Color.LightGray;
                        btn_Bullet.ForeColor    = Color.Black;
                        this.is_Bullets_Applied = false;
                    }
                    else
                    {
                        this.is_Bullets_Applied = true;
                        btn_Bullet.BackColor    = Color.Black;
                        btn_Bullet.ForeColor    = Color.White;
                    }
                }
            }
            else
            {
                if (pressed_Btn.Text == "Increase")
                {
                    text_View.increase_decrease_Indent(true);
                }
                else if (pressed_Btn.Text == "Decrease")
                {
                    text_View.increase_decrease_Indent(false);
                }
            }
        }