The main changes from the PayPal supplied code are the removal of the form tags and the inclusion of the asp:button. The reason for the change is that because ASP.NET pages are already web forms, we cannot simply add a 2nd form into the page (it would cause an error).

Another useful thing is that you can set the default button for the page, or different parts of the page. This example sets the default button when someone presses enter to the login button rather than the search button at the top of the page. You need to enclose the relevant controls in a panel control.

Protected Sub panelLogin_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles panelLogin.Load

Page.Form.DefaultFocus = Login1.FindControl(“UserName”).UniqueID
Page.Form.DefaultButton = Login1.FindControl(“LoginButton”).UniqueID

End Sub

http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=541116&SiteId=1

The following points summarize the causes and solutions from the forum and offer some additional help:

1. Check if you have changed the length of any fields in the underlying database table after creating the dataset. If you have, you may need to manually change them in the dataset as well. If you are using Visual Studio 2008, open the xsd file and click on the relevant field name. Ensure the maxlength property matches your new field length.

Check maxlength property

2. If you base your dataset off a view rather than a table, and that view contains a primary key field from the underlying table, visual studio may set unique to true for that field. If your view is constructed in such a way that the field is not unique, then the error will occur. In Visual Studio 2008, open the xsd file, click on the field and set unique to false in properties.

There were other causes of the error but these seemed to be the two most common.

Cheers,
Grant

The problem is that when users attempt to upload a file that is too large, it is difficult to capture and handle the exception that is created. The usual try..catch doesn’t handle the exception because the exception occurs before then. The exception is “System.Web.HttpException: Maximum request length exceeded”. You could of course increase the maximum file size but that defeats the purpose of the limit in the first place.

Here is one solution for handling the exception that is at least nicer than the standard ASP.NET exception message:

1. Create a global.asax file. If you’re using Visual Studio 2005 it will set up a number of common subroutines for you. You need to use Sub Application_Error. Your code should look something like this:

<script runat=”server”>
Sub Application_Error(ByVal sender As Object, ByVal e As EventArgs)
Dim currentException As Exception
currentException = Server.GetLastError.GetBaseException()
Response.Redirect(“/error.aspx?Err=” & Server.UrlEncode(currentException.Message))
End Sub
</script>

The application_Error sub fires as a last resort, in other words, when you haven’t explicitly handled the exception anywhere else in your code.

2. You can now create an error.aspx that displays the exception message (from the querystring). For this exception the message is “Maximum request length exceeded”. You could also test for the message and give users more information on the error.

Please let me know if you have any comments, suggestions, or improvements.

1. Create Directories:

md studentdirectory

2. Assign the student user account relevant permissions:

xcacls studentdirectory /T /E /G studentusername:F

3. Create a virtual directory in IIS for each student:

iisvdir /create “IISsitename” studentvirtualdirectoryname studentdirectory

4. Create a subweb for each student:

“C:\Program Files\Common Files\Microsoft Shared\web server extensions\50\bin\owsadm” -o install -p 1100 -w studentvirtualdirectoryname -u usernameWithSufficientPermissionsOnServer

5. Give the new subweb unique permissions:

“C:\Program Files\Common Files\Microsoft Shared\web server extensions\50\bin\owsadm” -o setperms -p 1100 -w studentsubwebname -i false -u usernameWithSufficientPermissionsOnServer

6. Give the student the author role on the subweb:

“C:\Program Files\Common Files\Microsoft Shared\web server extensions\50\bin\owsadm” -o roleusers -command add -u studentusername -p 1100 -w studentsubwebname -name Author

Here are the steps if you are using Expression Web, Visual Studio, or Visual Web Developer:

1. Open the Task Pane of your GridView and select Edit Columns
2. In the Selected Fields Box, select the column you want to edit
3. Find the HTMLEncode property and set it to false.
4. Find the DataFormatString property and set it to the appropriate formatstring. The standard format of a format string is {0:format string}

Some examples of format strings are:

{0:c} to format as currency
{0:M-dd-yyyy} to format as a date

For more formatting strings, go to Formatting Types on MSDN.

1. Accept text input into a web form that includes multiline text boxes. The text often includes line breaks.
2. The text is stored in a database such as SQL Server 2005. SQL Server 2005 has no problem storing the line breaks.
3. I then display the data in an ASP.NET gridview control. Because the control renders as HTML, it doesn’t recognize the newline escape characters.

The problem is how to convert the newline characters into <br />. Here is one solution. It is closely based on this MSDN article: http://msdn2.microsoft.com/en-us/library/xwewhkd1.aspx (regex.replace)

This C# example assumes you are using an ASP.NET FormView with a label called lblSampleText:

//Create a regular expression that matches a newline
string pattern = "\n";
Regex rgx = new Regex(pattern);
//Find the relevant label from the FormView
Label vL1 = checked((Label)FormView1.FindControl("lblSampleText"));
string inputStr = vL1.Text;
//Replace the newline character with br
string outputStr = rgx.Replace(inputStr,"<br/>");
// Display the resulting string
vL1.Text = outputStr;

This VB example assumes you are using a GridView with a TemplateField control. Inside the TemplateField control (ItemTemplate) is a label called lblSampleText.

Protected Sub GridView3_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView3.RowDataBound
If e.Row.RowType = DataControlRowType.DataRow Then
' Create a regular expression that matches a newline
Dim pattern As String = "\n"
Dim rgx As New Regex(pattern)
' Find the relevant label from the gridview
Dim inputStr As String = CType(e.Row.FindControl("lblSampleText"), Label).Text
' Replace the newline character with <br/>
Dim outputStr As String = rgx.Replace (inputStr, "<br/>")
' Display the resulting string.
CType(e.Row.FindControl("lblSampleText"), Label).Text = outputStr
End If
End Sub