What can I do to generate a field like this:

    public virtual System.Drawing.Image Photo
    {
        get { return (System.Drawing.Image)GetValue((int)TblTestFieldIndex.Photo, true); }
        set { SetValue((int)TblTestFieldIndex.Photo, value); }
    }

the Photo field is varbinary type in sql server. Do i need a type converter?

I suppose varbinary is mapped to a byte[], correct? So the answer would be, yes you need a type converter, if you need to change that to other type.

if field Photo is mapped to a byte[], it generate code:

public virtual System.Byte[] Photo { get { return (System.Byte[])GetValue((int)TblTestFieldIndex.Photo, true); } set { SetValue((int)TblTestFieldIndex.Photo, value); } } I want it is mapto Image and code generate like this

public virtual System.Drawing.Image Photo { get { return (System.Drawing.Image)GetValue((int)TblTestFieldIndex.Photo, true); } set { SetValue((int)TblTestFieldIndex.Photo, value); } }

Thank you.

Use a Type Converter.

Could you please give more details how to do that?

Please follow the docs on how to create a type converter. (Implementing a TypeConverter in the SDK documentation). And there you should convert from byte[] to Image and vica versa, for reading and saving.

Thank you Walaa