Thanks Jason for the reply.

In the meantime I managed to bind my data on the HierarchicalGrid. I do it using GridModel from a controller. I have a simple scenario where Customer Info is to be shown on top and then on Demand, a customer's orders should be shown in the child grid (i.e. as a 1 to N layout).

I have configured the GridModel, ColumnLayout, and Setup my model classes. However on the UI, I could only see the customer's data and when I try to drill down on a customer info to see its orders, it throws an error:

A first chance exception of type 'System.NullReferenceException' occurred in Infragistics.Web.Mvc.dll

Additional information: Object reference not set to an instance of an object.

I understand that I might be trying to use an un-initialized object, but I could not figure out which one.

Here are the highlights of the GridModel initialization:

var gridModel= new GridModel { AutoGenerateColumns = false, Width = "100%" };

gridModel.Columns = 

new List<GridColumn>
{
new GridColumn
{
Key = "CustomerId ",
HeaderText = "CustomerId",
DataType = "number",
Width = "50%"
},
new GridColumn
{
Key = "CustomerType",
HeaderText = "CustomerType",
DataType = "string",
Width = "30%"
}
};

//gridModel.InitialExpandDepth = 1;
gridModel.ResponseDataKey = "Records";
gridModel.PrimaryKey = "CustomerId";
gridModel.AutoGenerateLayouts = false;
gridModel.DataSourceType = "json";
gridModel.DataSourceUrl = parentDataSourceUrl;
GridColumnLayoutModel decModel = GetChildLayout();
gridModel.ColumnLayouts.Add(decModel);
gridModel.ColumnLayouts[0].DataSourceUrl = childDataSourceUrl;

gridModel.LoadOnDemand = true;

public static GridColumnLayoutModel GetChildLayout()
{
var layout = new GridColumnLayoutModel
{
ResponseDataKey = "Records",
Key = "Orders ",
PrimaryKey = "OrderId",
ForeignKey = "CustomerId",
Width = "100%",
AutoGenerateColumns = false,
AutofitLastColumn = true,
Columns =
new List<GridColumn>
{
new GridColumn
{
Key = "col1",
HeaderText ="col1",
DataType = "number",
Width = "50%"
},
new GridColumn
{
Key = "col2",
HeaderText ="col2",
DataType = "number",
Width = "30%"
},
}
};

return layout;
}

Here is my model classes:

public class Customer
{
public Customer()
{
Orders = new List<Order>();
}

public int CustomerId { get; set; }
public string CustomerType { get; set; }
public List<Order> Orders
}

public class Order
{
public int OrderId{ get; set; }
public string Col1{ get; set; }
public string Col2{ get; set; }
public string Col3{ get; set; }

//FK
public int CustomerId { get; set; }
}

Here is how I bind data to child layout

[DataGridSourceActionFilter]
public JsonResult GetOrdersRecords(string path, string layout)
{

var data = GetDataForOrders();
var gridModel = DataGridModelHelper.GetChildLayout();
gridModel.DataSource = data.Data.AsQueryable();
JsonResult jsonData = gridModel.GetData(path, layout); //I get "Orders" in the layout path
return jsonData;
}

Can you pin point any obvious mistake? Could you please explain the importance of layout parameter? I feel I have done something wrong around layout configuration...

Thanks for your help.

KP

One more thing Jason. Does igGrid supports sorting on multiple columns? Or can just one column be sorted at a time?

I will try to shell out my code in a run able stand alone app. The reason for going for GridModel is that we want to go for server side sorting, paging and filtering. And we though it will be easier to maintain at GridModel style, since it can be configured from a controller and we don't have an expert on JQuery.

I could configure the grid on the JQuery now, but I want to make the children load on Demand. Any pointers on how to make it on Demand? I tried setting loadOnDemand to true, but that does not do anything...

Thanks

KP