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How to handle single quote in SQL Query or DataSet.Select ?

zeemalik — Wed, 30 Jun 2010 07:53:35 +0000

Problem : When we try to select/filter records based on a column value which contains a single quote then the SQL server will give syntax error because there is a single quote in the start and at the end of SQL query normaly.

Solution 1: Parameterized Query

We can use parameterized query to avoid the single quote issue like this:

string VendorName = “John O’Corner”;

command.CommandText = “SELECT * FROM Products WHERE VendorName= @VendorName”;

command.Parameters.Add(
new SqlParameter(“@VendorName”, SqlDbType.VarChar, 50)).Value = VendorName;

Solution 2: Replace Single Quote

Another option is that you can replace single quote with two single quotes. This will give an effect of a string end then string start in SQL Query. This method is especially suitable while we are selecting records in a dataset.

SystemDataSet.ProductRow[] productRows = dataSet.Products.Select( ” VendorName = ‘” + VendorName.Replace( “‘”, “”” ) + “‘” );

Filed under: Asp.net Tagged: DataSet.Select, Filter, Single Quote, SQL Query

How to access deleted rows in a typed dataset?

zeemalik — Tue, 09 Mar 2010 07:32:55 +0000

Sometimes after doing some processing on a dataset and before finally committing the changes in the database we need to know some information about added, modified, deleted or dispatched rows in the dataset. One of the well known approaches is to loop the rows of a data set and check the ‘RowState’ value of each row which could be added, modified, deleted or dispatched. But when you are using a transaction in your code then you will notice that after updating the changes in database and before committing the transaction you will lose the deleted rows although you will still be able to get the rowstate of added and modified rows. This was irritating for me as i wanted to get the count of deleted rows in my code. The fortunately i came accross another nicer method of accessing added, modified, deleted and dispatched rows which is Table.GetChanges(‘RowsState’). In this way you can separately make tables for each kind of rows and then use them for your purpose. Here is an example of ‘Customer’ table.

DataTable tableAddedRows, tableModifiedRows, tableDeletedRows, tableDispatchedRows;

tableAddedRows = myDataSet.tables["Customer"].Rows()[0].Table.GetChanges( DataRowState.Added );
tableModifiedRows = myDataSet.tables["Customer"].Rows()[0].Table.GetChanges( DataRowState.Modified);
tableDeletedRows = myDataSet.tables["Customer"].Rows()[0].Table.GetChanges( DataRowState.Deleted );
tableDispatchedRows = myDataSet.tables["Customer"].Rows()[0].Table.GetChanges( DataRowState.Dispatched);

Now you can use these tables to do whatever you want. Please note that if there is no row of any one of these rowstates then its corresponding table will be null.

I hope this helps!

Filed under: Asp.net

The SMTP server requires a secure connection or the client was not authenticated

zeemalik — Wed, 18 Feb 2009 20:41:44 +0000

Problem: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Must issue a STARTTLS command first. c25sm1228430ika.11

Solution:

Public Shared Sub SendEmail()

Dim Message As New Net.Mail.MailMessage()

Dim FromEmail As New Net.Mail.MailAddress(“From Email Address”)

Message.From = FromEmail

Message.To.Add(“To Email Address”)

Message.Subject = “Subject of the Email”

Message.Body = “Body of the Email”

‘Message.SubjectEncoding = System.Text.Encoding.UTF8

‘Message.BodyEncoding = System.Text.Encoding.UTF8

‘Message.IsBodyHtml = False

‘Message.Priority = Net.Mail.MailPriority.High

Dim SmtpClient As New Net.Mail.SmtpClient(“smtp.YourEmailServer.com”, PortNo eg: 587 for gmail )

SmtpClient.EnableSsl = True

‘smtp.DeliveryMethod = Net.Mail.SmtpDeliveryMethod.Network

‘smtp.UseDefaultCredentials = False

SmtpClient.Credentials = New Net.NetworkCredential(“YourEmailAddress”, “YourEmailPassword”)

SmtpClient.Send(Message)

End Sub

Note: An important point to note is that you have to set the EnableSSl to True before you set the NetWork Credentials of your SMTP client.

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Posted in Asp.net

How to call client-side Javascript function after an UpdatePanel asychronous (Ajax) request is over

zeemalik — Tue, 27 Nov 2007 13:18:03 +0000

If you are using AJAX then the only way i have found yet to give an alert to a user on return to the Asynchronous post back is to add an “end request” handler to the PageRequestManager.

In this way you can tell the request manager to run a javascript function on returning from a Asynchronous post back event of AJAX.

Code for doing this is :

function load()

{
Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);
}

where “EndRequestHandler” will be the name of your javascript function you want to call.
Call the above function in Onload event of tag:

function EndRequestHandler()

{

alert(“You record has been saved successfully”);

}

Now If you want to give a different message based on your logic in server side code (code behind) then you can use a server side Hidden Field:

Set its value in server side code on Asychronous Post Back:

Protected Sub btn_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnCreateSample.Click

If condition Then

hdnValue.value = “do this”

Else

hdnValue.value = “do that”

End If

End Sub

Now you can check the value of this Hidden Field in your Client Side EndRequestHandler function and give a different alert to user based on its value:

function EndRequestHandler()
{
if (document.getElementById(‘<%= hdnValue.ClientID %>’).value == “do this”)

     {
          alert(“You record has been saved successfully”);
     }
     else
     {
          alert(“There is an error”);
     }
}

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