this works fine -

Access.Application acApp = new Access.ApplicationClass();
acApp.OpenCurrentDatabase(@"C:\temp\db1.accdb",false ,null);
object oMissing = System.Reflection.Missing.Value;

acApp.Run("ABC",ref oMissing,ref oMissing,ref oMissing,ref oMissing,
ref oMissing,ref oMissing,ref oMissing,ref oMissing, ref oMissing,ref oMissing,ref oMissing,ref oMissing,ref oMissing
,ref oMissing,ref oMissing,ref oMissing,ref oMissing,ref oMissing ,ref oMissing,ref oMissing,ref oMissing,ref oMissing,ref oMissing
,ref oMissing,ref oMissing,ref oMissing,ref oMissing,ref oMissing ,ref oMissing,ref oMissing);
acApp.Quit();

but I need to pass a few parameters to ABC

acApp.Run("ABC('par1', 'par2')", .... or acApp.Run("ABC 'par1', 'par2'", ..... generate error message "Could not find method  ABC('par1', 'par2')