Problem:
When using ObjectDataSource in Web Part and you only have your Assembly in GAC, you'll might see the following error:
The type specified in the TypeName property of ObjectDataSource
'myOds' could not be found.
You init the ObjectDataSource in your Web Part e.g., like this:
ObjectDataSource ods = new ObjectDataSource("Namespace.Class", "SomeMethod");
ods.ID = "myOds";
this.Controls.Add(ods);
Solution:
Add reference to the assembly in web.config like this (where MyAssemblyName is the name of the assembly of your Web Part).
<system.web>
<compilation>
<assemblies>
<add assembly="MyAssemblyName, Version=XYZ, Culture=neutral, PublicKeyToken=XYZ" />
</assemblies>
</compilation>
</system.web>
