If the a data field contains a base64 string you will need to programmatically convert the base64 string to binary image data before assigning it to the PictureBox item. The approach to convert the base64 string to binary image data is to use a user function in the PictureBox.Value expression:
PictureBox.Value = GetImageFromBase64String(Fields.ImageData)
where the GetImageFromBase64String
user function definition would be similar to this code snippet:
 imageBytes = Convert.FromBase64String(base64String);
(System.IO.MemoryStream ms =
image = Image.FromStream(ms);
For more information, please refer to the User Functions
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