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6. Next, select the User Control, and name it UserControl1.cs.
   
   
   
   
7. Open the UserControl1.cs file, and add the following namespace references:

   		using System.Windows.Forms;
   		using Office = Microsoft.Office.Core;
   		using PowerPoint = Microsoft.Office.Interop.PowerPoint;

8. Open the Ribbon1.cs fi le, and add the following namespace references:

   		using System.Windows.Forms;
   		using Office = Microsoft.Office.Core;
   		using PowerPoint = Microsoft.Office.Interop.PowerPoint;

9. Next, add the instance of the User Control and custom task pane to the Ribbon code file:

   		// Usercontrol instance to access from the Ribbon
   		    private UserControl1 PacktUserControl;
   		// Instance for Custom Task Pane to create
   		    private Microsoft.Office.Tools.CustomTaskPane PacktCustomPane;

10. Next, write the following code to show the custom task pane in the button click event of the Ribbon menu:

    		private void RibbonButton1_Click(object sender, RibbonControlEventArgs e)
    		{
    		// Initializing the UserControl in the ribbon
    		    PacktUserControl = new UserControl1();
    		// Add the UserControl to the custom task pane
    		    PacktCustomPane = Globals.ThisAddIn.CustomTaskPanes.
    			    Add(PacktUserControl, "Calendar");
    		// Set the custom task pane to visible
    		    PacktCustomPane.Visible = true;
    		}

11. On the ValueChanged event of the dateTimePicker , we are writing the code to insert the selected date.

    		private void dateTimePicker1_ValueChanged(object sender,
    		    EventArgs e)
    		{
    		    try
    			{
    			// Getting the active presentation slide
    			    PowerPoint.Slide PckTSlide = Globals.ThisAddIn.
    				    Application.ActivePresentation.Slides[1];
    			// Set the presentation type like text or image imsert option
    			    PacktTextShape = PckTSlide.Shapes.AddTextbox(Office.
    				    MsoTextOrientation.msoTextOrientationHorizontal,
    					50, 100, 600, 50);
    			// Set the text value as selected date time
    			    PacktTextShape.TextFrame.TextRange.Text = dateTimePicker1.
    				    Value.ToString();
    			// Font style properties
    			    PacktTextShape.TextFrame.TextRange.Font.Size = 48;
    				PacktTextShape.TextFrame.TextRange.Font.Color.RGB = Color.
    				    DarkViolet.ToArgb();
    			}
    			catch (Exception ex)
    			{
    			     MessageBox.Show(ex.ToString());
    			}
    		}

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