Decorate your view model property with the [DisplayFormat] attribute and specify the desired format:
[DisplayFormat(DataFormatString = "{0:N}", ApplyFormatInEditMode = true)]
public decimal TAll { get; set; }
and then in your view:
@Html.DisplayFor(x => x.TAll)
Another possibility if you don’t want to do this on the view model you could also do it inside the view:
@Model.tAll.ToString("N")
but I would recommend you the first approach.
Yet another possibility is to write a custom display template for the decimal type (~/Views/Shared/DisplayTemplates/MyDecimalTemplate.cshtml):
@string.Format("{0:N}", Model)
and then:
@Html.DisplayFor(x => x.TAll, "MyDecimalTemplate")