Sharepoint Impersonation.

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When you create a web form or web part for wss or sharepoint and work with list items for example you should impersonate the current logged user in your application to see who modified, added the list item. I chose this example to be the simplest.
So I created a web part for my sharepoint site.

I added this to the default project created when you choose Sharepoint Web Part project:
c# code:

private string customMessage = "Hello, world!";
[WebBrowsable(true),
WebDescription("Displays a custom message"),
WebDisplayName("Display Message"),
Personalizable(PersonalizationScope.User)]
public string DisplayMessage
{
get { return customMessage; }
set { customMessage = value; }

}

In the render function i added my code. To make a similarity to asp.net you can think of it as page_load handler. Whenever you refresh the page that has the web part on it it executes your code.
Here i get the current logged in user i display it on the screen and then i create a new item in the Announcements List as added by the user logged in:

protected override void Render(System.Web.UI.HtmlTextWriter writer)
{
try
{
HttpContext ctx = HttpContext.Current;
SPWeb web = SPControl.GetContextWeb(this.Context);

if ( (ctx.User != null) && (ctx.User.Identity != null))
customMessage=ctx.User.Identity.Name;
writer.Write(DisplayMessage);

And we show this way the current logged in user.
Now we impersonate the user and create a new item in the Announcements list in his name. Every logged in user has a token (it identifies the authentication process applied to the user).

SPSite impersonatedSiteCollection = new SPSite( SPControl.GetContextSite(this.Context).ID, token);
SPWeb oWebsiteRoot = impersonatedSiteCollection.OpenWeb();
oWebsiteRoot.AllowUnsafeUpdates = true;
SPList oList = oWebsiteRoot.Lists["Announcements"];

SPListItem oListItem = oList.Items.Add();
oListItem["Title"] = "My Item";
oListItem["Created"] = new DateTime(2004, 1, 23);
oListItem["Modified"] = new DateTime(2005, 10, 1);
oListItem.Update();
}
catch (System.ArgumentException e)
{
customMessage = e.Message ;
writer.Write(DisplayMessage);
}

I put it in a try catch sequence because the current logged in user might not have the rights to add a new item to that list and if so the page that contains the webpart will crash and he would not see it even though he has rights to. With the try catch the webpart will tell him that he has no rights.

Commerce Server 2009

DataGrid column width.

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I recently found out that the datagrid component doesn`t have the column property. The smartdevice project doesn`t have DataGridView in the toolbox, so you would have to work with the DataGrid componnent.

[All code below is in C#]
At first you must create a DataGridTableStyle :

DataGridTableStyle ts = new DataGridTableStyle();

ts.MappingName = “”;

ts.GridColumnStyles.Clear();
If you have a DataTable to use as a datasource for the grid :

DataTable t = getProduse();

Now if you have to create DataGridColumnStyles for each column in the datatable:

for (int i = 0; i < t.Columns.Count; i++)

{

DataGridColumnStyle Col = new DataGridTextBoxColumn();

Col.MappingName = t.Columns[i].ColumnName;

Col.HeaderText = t.Columns[i].ColumnName;

Col.Width = 400;

ts.GridColumnStyles.Add(Col);

}

After this you add the DataGridTableStyle to the DataGrid:
dataGrid1.TableStyles.Add(ts);
Now when you select the DataSource the grid will have the Style you want:
dataGrid1.DataSource = t;

Commerce Server 2009
By Ing. Msc. Dan Gheorghe