Error editing a blob field in ArcGIS Engine

IServerContext serverContext = GetServerContext(agsConn, serviceName);
ILayer layer = GetILayer(layerName, serverContext);
IWorkspace workspace = GetIWorkspace(layer);

var feature = GetIFeature(objectId, workspace, layer);

var workspaceEdit = (IWorkspaceEdit)workspace;
workspaceEdit.StartEditing(false);
workspaceEdit.StartEditOperation();

var index = feature.Fields.FindField(featureDetailName);
IField field = feature.Fields.get_Field(index);
byte[] byteArray = {1, 2, 3};
MemoryBlobStream blob = new MemoryBlobStream();
((IMemoryBlobStreamVariant)blob).ImportFromVariant(byteArray);
if (field.CheckValue(blob))
{
    feature.set_Value(index, blob);
}

feature.Store();

workspaceEdit.StopEditOperation();
workspaceEdit.StopEditing(true);

serverContext.RemoveAll();
serverContext.ReleaseContext();

var workspaceEdit = (IWorkspaceEdit)workspace;
workspaceEdit.StartEditing(false);
workspaceEdit.StartEditOperation();
var feature = GetIFeature(objectId, workspace, layer);