Converting a class to generics in C#

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C#

generics

class BackupVirtualDataSource : AbstractVirtualListDataSource
    {
 List<BackUpInfo> Objects;
        public int ItemCount = 0;
        //BackUpInfo
        public BackupVirtualDataSource(VirtualObjectListView listView, List<BackUpInfo> ObjList)
            : base(listView)
        {
            this.Objects = ObjList;
            ItemCount = (ObjList == null) ? 0 : ObjList.Count;
        }

        public override int GetObjectIndex(object model)
        {
            return this.Objects.IndexOf((BackUpInfo)model);
        }

        public override object GetNthObject(int n)
        {
            BackUpInfo p = null;
            try
            {
                p = this.Objects[n % this.Objects.Count];
                return p;
            }
            catch (Exception ex)
            {
                cGlobalSettings.oLogger.WriteLogException("| BackupVirtualDataSource.cs::GetNthObject() |", ex);
            }
            finally 
            {
                p = null;
            }
            return p;
            
        }

        public override int GetObjectCount()
        {
            return ItemCount;
        }

       
    }

i want to convert the following class to generics but iam getting error
The type or namespace name T could not be found

What I have tried:

class BackupVirtualDataSource : AbstractVirtualListDataSource
    {
 List<T> Objects;
        public int ItemCount = 0;
        //BackUpInfo
        public BackupVirtualDataSource(VirtualObjectListView listView, List<T> ObjList)
            : base(listView)
        {
            this.Objects = ObjList;
            ItemCount = (ObjList == null) ? 0 : ObjList.Count;
        }

        public override int GetObjectIndex(object model)
        {
            return this.Objects.IndexOf((T)model);
        }

        public override object GetNthObject(int n)
        {
            T p = null;
            try
            {
                p = this.Objects[n % this.Objects.Count];
                return p;
            }
            catch (Exception ex)
            {
                cGlobalSettings.oLogger.WriteLogException("| BackupVirtualDataSource.cs::GetNthObject() |", ex);
            }
            finally 
            {
                p = null;
            }
            return p;
            
        }

        public override int GetObjectCount()
        {
            return ItemCount;
        }

       
    }