how to set default image to the label

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C#

I have program in which images are stored as byte in database and are retrieved and displayed in gridview and then to the label. Some code numbers didn't have images in database. I need to set default images when ever the image is null. I need to show it only in the label. Instead of image button I have used label to display the images.

Here is the code for displaying image to the gridvie from database.

<img src='data:image/jpg;base64,<%# Eval("img") != System.DBNull.Value ? Convert.ToBase64String((byte[])Eval("img")) : string.Empty %>' alt="image" height="250px" width="275px"/>

And here is the code for displaying images in the label

Label62.Text = ((ITextControl)GridView1.Rows[0].Cells[55].Controls[0]).Text;

so how can I set a default image to the label, whenever the image is null.