Hi,
I assume that your three tier as below
1. Presentation layer
2. Business layer
3. Data Layer
Datagrid view contains in presentation layer. You canmake call from presentation layer to Business layer
For example , you want to fill the products details in datagrid view
dataGrid.DataSource=ProductManager.GetProducts();// this method can be return dataset or product entirt list Like List<Product>
ProductManager class exist in the business layer and this has a method GetProducts. This method call a method in the database layer. The method in the dtabase layer will read data from the database and return that value to businesslayer, busineelayerpass this data to prentation layer.
If you need any more help, please ask.
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