WrapText:
Wrapping text fits overflown text withing cell boundary. Microsoft Office WrapText is a boolean property which has set and get methods returns true, false.
Prerequisites:
- Visual Studio 2015 or above having Microsoft Office for Developer Tool installed
- Create Excel Addin in C# code style
- Create a ribbon designer and put button
Input source:

In above screenshot the text written in Cell “A1” is overflowing. Below code will wrap text inside cell and upon toggling it back it will unwrap the text:
Code Wrap Text:
private void btnWrapText_Click(object sender, RibbonControlEventArgs e) { //Capture user selection excel.Range oRange = Globals.ThisAddIn.Application.Selection; //Toggle Wrap property if(!oRange.WrapText) oRange.WrapText = true; else oRange.WrapText = false; }
Output Wrap Text:

Let’s click back and see the unwrap text will happen as shown below:

Next: Toggle merge/unmerge cell contents in Excel VSTO C#