What is the difference between "" and " "
For which one i can use string.Empty.
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I have drop dowm menu as follow.
<asp:ListItem Value="">none</asp:ListItem><asp:ListItem Value="STO">Stock</asp:ListItem><asp:ListItem Value="ORD">Order</asp:ListItem>
If I chose none, it stores data as "Null"
If I Query the data as below, I don't get the data has value of "Null"
SELECT tabale From type Where type <> STO or type <> ORD
I get data that has empty string but not Null.
Here is my question.
1, How do I write dropdown menu value in oder to get empty string instead of Null?I did <asp:ListItem Value="">none</asp:ListItem> but this stores Null.
2, Why this Query won't pick up Null?SELECT mytabale FROM type WHERE type <> STO or type <> ORD
Thank you for your help.
Anyone have any experience with this?
We are using VS 2005 for the front end, and vs 2010 for the web services part (asmx), not wcf yet.
Web service works just like the vs2005 when run locally, no problems.
Connecting to it from a test app returns an empty string. Connecting to a 2005 app doesn't!
Anyone run into this before or have a suggestion? Surely vs 2005 can connect to web services from a later version?
I have a table in an Sql Server Database from which I want to fetch data to a form.
[ID] [int] IDENTITY(1,1) NOT NULL,
[Headline] [varchar](max) NULL,
[Text] [varchar](max) NULL,
I want to check both Headline and Text to see if they are null, and if so display an empty string each for them. I've looked at some tutorials but don't yet understand really how to use it. DBNull? DataRow.IsNull? Something else? Can I check both Headline and Text at the same time or do I need do check them separately?
For an application I am working on, I am keeping some of the strings for the UIÃÂ in a ResourceDictionary, which is defined in XAML, like so:
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"ÃÂ ÃÂ ÃÂ xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"ÃÂ ÃÂ ÃÂ xmlnsystem="clr-namespaceystem;assembly=mscorlib"ÃÂ ÃÂ ÃÂ >
ÃÂ ÃÂ ÃÂ <systemtring x:Key="String1">String 1</systemtring>ÃÂ ÃÂ ÃÂ <systemtring x:Key="String2">String 2</system
I'm trying to do date validation on a date and time picker through code (i want to make sure that the date is later than today and that the next date is at least one day later than that).
But when i try to get the value in the chagned event, i keep getting empty string as value.
What am i doing wrong here??
This is the code:
public void LeaveRequestFrom_Changed(object sender, XmlEventArgs e)
// Write your code here to change the main data source.
XPathNavigator xroot = MainDataSource.CreateNavigator();
XPathNavigator fromdate = xroot.SelectSingleNode(
if (fromdate.Value != "")
//Make sure the from date is in the future
if (DateTime.Parse(fromdate.Value) < DateTime.Today.AddDays(1))
I want to insert an empty string in a nvarchar field and a default date like a base date in a datetime field inside a stored procedure without passing it the value thru a parameter
how is this done?
INSERT INTO deals_SoldItems (
this dont work
We have developed a Webservice which returns data in the form of xml to client. When we access the webservice from our brower, we were able to see the message with empty string. But in SSRS dataset designing we dont see column at all.
For example:- Webservice developed returns the XML data to client.When we bound this webservice has datasource for dataset, we dont see column in dataset which contains empty string or null.
How can i have column present in dataset in though XML element value is null or empty.
Like DOB in employee xml is sent to client. But this XML contain DOB with empty data like <DOB></DOB>. Since DOB xml element is empty we could not see this DOB column in dataset of Report. How can show tht DOB column in dataset
I have pass following SQL Query to the through ObjectDataSource
SELECT RequesterID, CompanyID, Name, emailID, Department, JobTitle, MobileNo, LandLine, Ext, Remarks
Where Name Like @Name + '%'
And I am passing parameter through QueryString and My idea is like when empty string is pass it should show me all records but when I am passing empty string ObjectDataSource is making NULL and I am not getting desire result
Kindly can somebody help me on that. It is okay if you change query of help me on objectDataSource.
Technology used : VS2008, VB.NET, LinqToSQL, BindingSource
I used LinqToSQL to create a detailsform. So I have a Textbox bound to a Varchar column in the dababase. When I created a record with the form it stores some columns as NULL values which is perfect. When I change the value of the textbox to something and
do a db.SubmitChanges() the value is stored.
However, when I make the textbox empty and save, the value in the database is an empty string. I want it to be NULL. How can i achieve this?
From my other post i get a result from a query, the query gives some values.I want to write the values to a file, but it is possible that one of the values is empty, when I try to write it with a empty value (for instance if CList.value2 is empty) then I get a Null error. how can i just write the entire record, including the empty on (cause the fil is a csv file).
So how can i avoid the Null error?
If Not String.IsNullOrEmpty(tbFilenaam.Text) Then
Dim oStWriter As New StreamWriter(Server.MapPath(tbFilenaam.Text))
For Each CList In retVal1
oStWriter.WriteLine(CList.value1 + ";" + CList.value2)