I am using Infragistics.Web.Mvc version 3.11.2.1023. I have a grid using simple filtering.  Here is how I am initializing my grid:

public static void InitializeGridOptions(GridModel model, List<GridColumn> columns)
{
     foreach (var column in columns)
          model.Columns.Add(column);
 
          model.Width = "100%";
          model.Height = "700";
 
         var filtering = new GridFiltering()
         {
             Mode = FilterMode.Simple,
             Type =  OpType.Remote,
             FilterDelay = 1500
         };
         model.Features.Add(filtering);
 
         var sort = new GridSorting()
         {
             Mode = SortingMode.Multiple,
             Type = OpType.Remote
         };
        model.Features.Add(sort);
 
        var paging = new GridPaging()
        {
            PageSize = 30,
            Type = OpType.Remote,
             PageSizeList = { 5, 10, 15, 20, 30, 40, 50 }
        };
        model.Features.Add(paging);
 
        var selection = new GridSelection()
        {
            Mode = SelectionMode.Row,
            MultipleSelection = true
        };
        model.Features.Add(selection);
 
        var resizing = new GridResizing()
        {
            AllowDoubleClickToResize = true
        };
        model.Features.Add(resizing);
    }

In the filter box underneath the heading of any columns, if I type a comma, the grid crashes on the GetData function with the following error on the gridmodel.GetData function:

StartIndex cannot be less than zero.
Parameter name: startIndex

Stack trace:

   at System.String.Remove(Int32 startIndex, Int32 count)
   at Infragistics.Web.Mvc.GridFiltering.ReplaceLast(String s, String f, String r)
   at Infragistics.Web.Mvc.GridFiltering.TransformDataSource(NameValueCollection queryString, IGridModel grid, IQueryable& queryable)
   at Infragistics.Web.Mvc.GridModel.DataBindInternal()
   at Infragistics.Web.Mvc.GridModel.DataBind()
   at Infragistics.Web.Mvc.GridModel.GetData()
   at ICMDB.Controllers.DeviceModelController.GetData() in C:\Users\DNatoli\Documents\Visual Studio 2010\Projects\ICMDB\ICMDB\Controllers\DeviceModelController.cs:line 51
   at lambda_method(Closure , ControllerBase , Object[] )
   at System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters)
   at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters)
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
   at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass15.<InvokeActionMethodWithFilters>b__12()
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation)