Retrieve image and display in picturebox with image path stored in database c#

I have Image Paths stored in my database under a column called Image in the format of Images\ac.jpg The path is already stored in a textbox called txtImage.Text. I am trying to display it in a picturebox control but I get the following error:

An unhandled exception of type 'System.IO.FileNotFoundException' occurred in System.Drawing.dll

Additional information: Images\ac.jpg

pbCoffeeImage.Image = System.Drawing.Image.FromFile(txtImage.Text);