Argumentoutofrangeexception: индекс был вне диапазона. Должно быть неотрицательным и меньше размера коллекции

I'm using mvc core And I ran into a problem

here is my code

public async Task<IActionResult> Index(string filter, int page = 1, string sortExpression = "product")
    {
        List<String> arr = new List<string>();
        var qry = _context.Model.Where(op => op.Type == "Laptops").AsQueryable();
        int i = 0;
        if (!string.IsNullOrWhiteSpace(filter))
        {
            string[] parts = filter.Split(',');
            foreach (var item in parts)
            {
                arr.Add(item);
            }
            while (i<=arr.Count)
            {
                qry = qry.Where(op => op.product.Contains(arr[i]));
                i++;
            }
            var model = await PagingList.CreateAsync( qry
                           , 12, page, sortExpression, "product");
            model.RouteValue = new RouteValueDictionary {
                { "filter", filter}
            };
            return View("Index", model);
        }
        //var model = await PagingList.CreateAsync(
        //               qry, 12, page, sortExpression, "product");
        //model.RouteValue = new RouteValueDictionary {
        //    { "filter", filter}
        //};
        return View();
    }
}

An unhandled exception occurred while processing the request.
ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
System.ThrowHelper.ThrowArgumentOutOfRange_IndexException()

InvalidOperationException: An exception was thrown while attempting to evaluate a LINQ query parameter expression. To show additional information call EnableSensitiveDataLogging() when overriding DbContext.OnConfiguring.
Microsoft.EntityFrameworkCore.Query.ExpressionVisitors.Internal.ParameterExtractingExpressionVisitor.Evaluate(Expression expression, out string parameterName)