Load assembly dinamically

[Chepre]

Hi,

I've the following problem. I load an assembly dinamically through code, but I can't call the method GetCredentials correctly, it's allways null.

Assembly assem = Assembly.LoadFrom(@"C:\Program Files\Common Files\Microsoft Shared\web server extensions\12\ISAPI\Microsoft.SharePoint.Portal.SingleSignon.dll");
Type typCred = assem.GetType("Microsoft.SharePoint.Portal.SingleSignon.Credentials");
System.Type[] arrTypes = new System.Type[3];
arrTypes.SetValue(Type.GetType("System.UInt32"), 0);
arrTypes.SetValue(Type.GetType("System.String"), 1);
arrTypes.SetValue(Type.GetType("System.String[]&"), 2);
 
MethodInfo miGetCred = typCred.GetMethod("GetCredentials", arrTypes);
UInt32 UI32 = Convert.ToUInt32(1);
 
object[] arrParams = new object[3];
arrParams.SetValue(UI32, 0);
arrParams.SetValue(SSO_APPLICATION_NAME, 1);
arrParams.SetValue(rgGetCredentialData, 2);
 
miGetCred.Invoke(null, arrParams); // Value is null and rgGetCredentialData also.
 

I don't know what I'm doing wrong. Any help would be greatly appreciated.

Regards,
Thomas