c# internal abstract class

how will i access members of  internal abstract  class in another class with different name space.

sample ->

file name = a.cs
namespace xyz
{
internal abstract  class bm
    {
      public   bool abc(bool userDefined)
        {
            return true;
      }
   }
}



file name = b.cs

namespace ppp
{
    internal class kl  :    gh   // 2.2
    {
        private xyz.bm  b160 =  null ;    // i did this
      bool b0 = true;

       public void updateFeature(bool Check)  
        {
     
                b0 = this.b160.abc(Check);
             
       
        }

    }
}
rnsrAsked:
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ste5anSenior DeveloperCommented:
An abstract class is only a basic template which cannot be instantiated. To "use" it, you need to create a class in your second namespace, which derives from it.

So this should work:

namespace ppp
{
	using xyz;
	
	class MyBMImpl : bm {}	

	internal class kl : gh
	{
		private MyBMImpl b160 =  new MyBMImpl();
		bool b0 = true;

		public void updateFeature(bool Check)  
		{     
			b0 = this.b160.abc(Check);            
		}
	}
}

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