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So I create a global dbcontext and save it in a static class variable. I am able create select, create new entities, do inserts and updates via the dbcontext in code behind calls without a problem I want to use the same dbcontext in my entitydatasource controls within my webforms, for concurrency reasons. Edit To use the Net Tiers Web Library you'll need to add a connection string... And yes, by the way, don't forget to add references to your Data, Entities, and Web projects, by right clicking on your web project / web site and selecting 'Add Reference'.Edit Strongly Typed Data Source controls: You will find that just by typing Edit Here's the result of of the form.This is great when you need to change the type at runtime, or maybe you have written your own methods within the Data Access Layer that you would like to call, then you would simply use the Entity Data Source control.Edit The Web Library adds a collection of user interface controls to your toolbox such as the strongly bound repeaters, Entity Grid View, Entity Drop Down List (and bound field version), Bound Radio Button Field, Hyperlink Field, Entity Label and a Grid View Search Panel.I have included the stack trace for the exception and the end of this text. Net 4.0 Framework and C#.) I have a very simple CRUD application that uses the List Views bound to Entity Data Sources. When a field exceeds the Max Length of the field as defined in the Entity Model I would like to handle that exception and just output it to the user. Entity Data Source' does not have a public property named 'On Exception'.

Design View: Taking the form and selecting only the columns that I want, we create a nice grid. The wonderful part of the Typed Data Source control is that you don't have to do anything when you want to edit/insert/delete an object.If you choose to participate, the online survey will be presented to you when you leave the Msdn Web site. control must store information about the original values of the properties of loaded objects in the view state for the page.If you do this, Object Services cannot track concurrency in updated objects, and you must implement your own concurrency checks.These checks must ensure that the updates that were made in the data-bound control do not conflict with changes that were made in the data source.Whenever the Entitydatasource needs an objectcontext to read,update etc, it calls On Context Creating. I am creating the dbcontext on the first On Context Creating call, caching in a static class variable and reusing for future On Context Creating calls. NET Entity Data Model โดลคลิกควาที่ Project เลือก Add New Item เลือก ASP.NET Entity Data Model เลือก Yes เพื่อเก็บ Code ไว้ใน App_Code เลือก Generate from database เลือก New Connection เลือก Microsoft SQL Server กำหนด Connection ของ SQL Server เลือก Connection ที่ได้จากการสร้าง เลือก Table ได้ object ชื่อ customer ดังรูป ลาก Entity Data Source มาไว้ใน Web Form เลือก Configure Data Source เลือก Connection ของ Entities เลือกรูปแบบการอ่านข้อมูลจากตาราง ทดสอบกับ Control ของ Grid View ได้ผลลัพธ์เหมือนกับในรูป สำหรับตัวอย่างนี้สามารถใช้ได้ทั้ง VB.The Web Library adds a collection of user interface controls to your toolbox such as the strongly bound repeaters, Entity Grid View, Entity Drop Down List (and bound field version), Bound Radio Button Field, Hyperlink Field, Entity Label and a Grid View Search Panel.To use the Net Tiers Web Library you'll need to add a connection string... And yes, by the way, don't forget to add references to your Data, Entities, and Web projects, by right clicking on your web project / web site and selecting 'Add Reference'.

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