Thom Robbins: DataGrid Programming

Code Camp II: The Return!

Thu, 22 Jul 2004 15:20:34 GMT

*********CALL FOR SPEAKERS*********

Developer Code Camp II: The Return!

October 16/17, 2004

October 16 – 8:30 AM – 9PM

October 17 – 8:30 AM – 4PM

Microsoft Waltham

Schedule: http://radio.weblogs.com/0131777/CodeCamp2/code2.htm

General Call for Speakers

Code Camp II is looking for speakers and session leaders.

Code Camp II: The Return is looking to be even bigger and better than anything we have done before. The secret is you! This is a New England developer community based event that requires both speakers and attendees. The continuing goal of the Code Camps series is to provide an intensive developer to developer learning experience that is fun and technically stimulating. The primary focus is on delivering programming information and sample code that can be used immediately. The event is free and all slides, manuals and demo code are provided free!

This two day camp is hosted in our Waltham facility. As a community based event this is a general call for speakers and session leaders to help make this event a success. Based on your feedback, Code Camp II will now feature two types of 1.5 hour sessions and three defined tracks

Do you have something to say?

Requested Session Types:

Code focused presentation – These are presentations that include both power points and code demos. Given the audience that is attending it is important that a large amount of the presentation is focused on code and coding related techniques. Sample topics include How To and Best Practice Sessions.

Chalk Talks – These are new to the Code Camp. These sessions are designed as a facilitated discussion around a specific topic. No pre-canned demos, or pre-prepared code samples allowed! They are presented as a free form facilitated discussion that leverages the expertise of the presenter and the combined knowledge of the group to explore a specific topic.

Additionally, based on feedback we are sponsoring the following three tracks. All presentations must fall into these tracks to be considered. One of the strongest pieces of feedback from the last Code Camp was to provide a better organized set of tracks:

Code Camp Tracks:

Smart Client – This track is designed for presentations or chalk talks on topics related to Smart Client related development topics. This includes Windows Forms applications, Microsoft Office or mobile devices.

Web Track – This track is designed for presentations or chalk talks about Web based development that includes ASP.NET and Web Services.

Data Track – This track is designed for presentation and chalk talks about data storage technologies that includes SQL Server and XML.

********Submit Your Sessions********

Please complete the following and return it to trobbins@microsoft.com by September 15.

Once your session abstract is received we will review and provide scheduling for the selected sessions by October 1. All slides and code samples for the presentation must be delivered by October 14. If we are unable to fill all the time slots for the two days, the code camp will be shortened. It is the community that makes this event a success!

Name:
Company:
Email:
Phone:
Session Type:	Chalk Talk/Presentation (Select one)
Track:	Web/Smart Client/Data (Select one)
Level	200/300/400
Session Name:
Session Description:

Accessing Casted Controls

Sun, 30 Nov 2003 20:38:04 GMT

Let’s start with a DataGrid that looks like the following

If we wanted to retrieve the value that a user selects from the drop down list control shown in Column 4 into a value. We would use the following code.

' Gets the value the dropdown control in the fourth column
Dim drop As DropDownList
drop = CType(e.Item.Cells(4).Controls(1), DropDownList)currentquantity = drop.SelectedValue

The above code is creating a local copy of the control using a cast. Once the local copy is created you can access the standard controls defined for the control.

Programatically Creating a DataGrid

Sat, 29 Nov 2003 01:40:06 GMT

Someone recently asked me how you can programmatically create a DataGrid. So here is an example that I put together.

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

CreateGrid()

End Sub

Public Sub CreateGrid()

'declare a new datagrid and set properties

DataGrid1.BorderWidth = Unit.Pixel(2)

DataGrid1.CellPadding = 10

DataGrid1.GridLines = GridLines.Both

DataGrid1.BorderColor = Color.Blue

DataGrid1.ShowHeader = True

DataGrid1.AutoGenerateColumns = False

DataGrid1.SelectedItemStyle.BackColor = Color.Yellow

'add bound columns to the datagrid

Dim datagridcol As New BoundColumn

datagridcol.HeaderText = "Candy Type"

datagridcol.DataField = "CandyType"

DataGrid1.Columns.Add(datagridcol)

datagridcol = New BoundColumn

datagridcol.HeaderText = "Description"

datagridcol.DataField = "CandyDescription"

DataGrid1.Columns.Add(datagridcol)

Dim selectcol As New ButtonColumn

selectcol.ButtonType = ButtonColumnType.PushButton

selectcol.Text = "Purchase"

selectcol.CommandName = "Select"

DataGrid1.Columns.Add(selectcol)

'bind datagrid

DataGrid1.DataSource = GetDataSet()

DataGrid1.DataBind()

'add datagrid to the page

Page.Controls(1).Controls.Add(DataGrid1)

End Sub

Private Function GetDataSet()

Dim ws As New localhost.SweetsService

Dim ds As New DataSet

ds = ws.GetCandyInfo("truffles")

Return ds

End Function

End Class

Adding a checkbox column to a DataGrid

Sat, 29 Nov 2003 01:06:55 GMT

Adding Custom Checkbox to a DataGrid

Let’s start with a DataGrid that binds to a DataSet that is returned from a Web Service using the following code.

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

'Put user code to initialize the page here

Dim ws As New localhost.SweetsService

Dim ds As New DataSet

ds = ws.GetCandyInfo("truffles")

DataGrid1.DataSource = ds

DataGrid1.DataBind()

End Sub

When the page loads, the DataSet is returned and bound to the DataGrid and appears like the following.

For this example, we want to add a custom checkbox control to this DataGrid control. The following steps show one of several ways that is can be done.

Right click on the DataGrid and select Property Builder.

Within the Property Builder add a “Template Column” and select “OK”

Right click on the DataGrid and select “Edit Template”. This menu item is now available after the “Template Column” was added. This will allow you to edit Columns[0] which is the custom item that we added.

The template editor has four sections: Header Template, Item Template, EditItem Template and Footer Template. Drag a checkbox control from the Tools menu into the Item Template section.

When you run the page the checkbox now appears in the DataGrid.