System.Drawing - Parameter is not valid

Question

using code:

byte[] toBytes = Encoding.ASCII.GetBytes(objgroupconfereneResponse.groups[i].grpIcon.ToString());

if (toBytes != null)

{

MemoryStream ms = new MemoryStream(toBytes);

ms.Position = 0;

picboxserver.Image = Image.FromStream(ms);

}

 

please suggest me how to resolve it.