The text is in RTF fornmat. You can convert the RTF text to plain text using the RichTextBox inthe System.Windows.Forms namespace.
First you create a richtextbox and provide it with the text.
System.Windows.Forms.RichTextBox richTextBox = new System.Windows.Forms.RichTextBox();
richTextBox.Rtf = rtfText;
You can then read the plain text
string plainText = richTextBox.Text;
When doing this on the text in your example it plainText returns: this is from db.