innerjoin

var userRoleChangeRequestList = await UnitOfWork.UserRoleChangeRequestRepository
                    .Get(x => x.IsActive && !x.IsDeleted).ToListAsync();


                var userList = await UnitOfWork.UserRepository
                    .Get(x => x.IsActive && !x.IsDeleted && (x.RoleID==(int)EnumUserRole.Learner || x.RoleID==(int)EnumUserRole.Instructor)).ToListAsync();

                var roleList= await UnitOfWork.RoleRepository
                    .Get(x => x.IsActive && !x.IsDeleted).ToListAsync();

                var res = from userRoleChangeRequest in  userRoleChangeRequestList
                          join user in userList
                              on userRoleChangeRequest.UserID equals user.UserID
                          join role in roleList
                         on user.RoleID equals role.RoleID
                          select new
                          {
                              UserRoleChangeRequestID= userRoleChangeRequest.UserRoleChangeRequestID,
                              UserID= userRoleChangeRequest.UserID,
                              RoleID= userRoleChangeRequest.RoleID,
                              Remarks= userRoleChangeRequest.Remarks,
                              DocumentURL= userRoleChangeRequest.DocumentURL,
                              StatusID= userRoleChangeRequest.StatusID,
                              Email=user.Email,
                              Role= role.RoleName
                          };