In this test application, I am filtering by two ControlParameters. As you can see in the first codeblock, both parameters have a default value of %. This code works great. However, in the second code block, please note that the Default Values are eliminated. The second code block works as long as neither Textbox's text is blank. For some reason, when .NET evaluates the filter expression and inserts "" into the expression, it seems to bug out and case none of my results to be filtered.
I am able to verify this behavior by setting the defaultvalue="" for each ControlParameter.Obviously I have found a workaround, but I would like to know why the FilterExpression breaks down when an empty string is provided.
Code Block 1:
<asp:SqlDataSource ID="Customer_Data" runat="server"
ConnectionString='<%$ ConnectionStrings:connectionString %>'
SelectCommand="SELECT Station, StoreFront, CustomerID as CustID FROM vStations" [code]...
I get the Erorr: Input String was NOT a correct format.
The first three controlparameters are STRINGS and they work fine.
However the last two populate the controlparameter from text boxes that can only accept numbers and decimal point.
First the text boxes for {3} and {4} string parameters in the SQL filterexpression: [Code]....
And then the SQLDatasource control parameters[Code]....
The last two control parameters are the ones is question as they feed {3} and {4} parameters in the filter expression, NOTICE how I set the type="double".The data input is expected to be like 152.25 or 3.6 or 4 etc,So why am I getting this error: [Code]....
So I found an example on how to search gridview using filterexpressions on this site (Filter GridView with TextBox using FilterExpression in SqlDataSource in ASP.Net), but now if I try to search with an apostrophe in the textbox, the code fails.
Here's the link to the the article/source - [URL] .....
Using MVC 2 and VS 2010 RC.I have a varchar database column set to NOT NULL and I use the Entity Framework to bind the column to a textbox. I want a user to be able to leave the textbox blank and have an empty string inserted into the database column. However, MVC is trying to set the property to null during the Create postback, which causes ModelState.IsValid to be false and subsequently the validation UI is triggered with the message "The value '' is invalid".Here is the model:
[Code]....
The controller:
[AcceptVerbs(HttpVerbs.Post)] public ActionResult Create(Candidate c ) { if (ModelState.IsValid) // This is false when the textbox is left blank.
I'm trying to write a regular expression that allows positive & negative floating point numbers, but doesn't allow empty strings and characters.I have managed to create this
[Code]....
but it allows empty strings and I can't figure out how to add [+-].
My program is a web app which asks the user to input a temperature.
i am using a search box for my application which returns a dataset. however when i click on the search button it returns an empty table result. how could i add validation so it doesnt accept empty strings or numbers.
What is the proper way to check for null or empty strings on dynamic objects? This is the only solution I've found so far:
if (admin.PasswordHash.GetType() == typeof(DBNull) || admin.PasswordHash == string.Empty)
If the field is null, the object returned is DBNull.Value, but if the field is empty string, it's return as a System.String object. This makes it impossible to do regular "admin.PasswordHash == DBNull.Value" check, as that will fail whenever the field has been set to empty string. Is my example the right (and only) way to go?
we have a AutoGenerateColumns-enabled WmxDataGrid in which we are able to update table rows in a DataBase connected with a SqlDataSource.
Each time we clear a field an empty string is written to the database where we want to write DBNull values.
At the moment we generate the update string via UPDATE... SET.. and the SQL Server function NULLIF(value, '').
Works proper but when I want to add the values to e.NewValues in BeginUpdate event I'm not able to read the values from the auto generated text boxes. How do I do that? Is there an easier way to automatically convert empty strings to NULL values?
I need to be able to hide or disable a multitude of items (detailsviews, gridviews) when an SqlDataSource returns no rows. So if the page is reposted and no rows are selected, all the controls would be disabled.
I need to be able to check programatically if a SqlDataSource contains no rows, and make a Placeholder visible if it does contain rows, and invisible if it doesn't. I seem to be able to return the affected rows using SqlDataSource1_Selected, but turning the placeholder invisible never works.
turning the placeholder off and on depending on whether the data source contains rows?
I've been using the FilterExpression for the building of my GridView. I've built with this ability before, normally for searching for the name of an individual. However, the new project I'm working on has a small problem. I'm using an AND statement to filter the name via textbox and I'm also checking if the form was completely finished and if the form is reviewed via radio buttons.
Below is the code, but the problem is this. If any of the fields are blank (text field is left blank or the "both" is selected from the radio buttons) the form doesn't process my filter.
Is there an easy way to apply all three filters in a mix and match fashion (like no name, completed, not reviewed or any combination thereof)?
I would change the filterexpression depending to the choice of some DropDownList but, i've tryed with ObjectDataSource_Filtering event but it seems that non reevaluate the filter.is it the right event?i've to do any other operations after changing the filterexpression?
I have a gridview with two bound fields. On clicking a button i want to display the values in first row of gridview in two textboxes. But if gridview cell is empty i am getting the text in textbox to which the value of cell is given as -' 'i know my problem will be solved if i use the template fields instead. But i want a solution while maintaining the bound fields ,if any.
I have a sql database that on some field will have a empty string/field. I am using a Datalist to display my results. How do I not make the labels that are empty not display? Currently if the field is empty it will leave a space there which my goal is if the field is empty do not leave a white space instead move the other colunms up.
I am working with a gridview that pulls data from a SQL database based on selections in dropdown lists. The source table has six columns for attributes of the selection, but depending on what is chosen, there could be anywhere from one to six of those that are empty (all null values). When the column is empty, I would like to have it hidden so the page is less clunky and confusing.
I've searched around for an answer for the past couple days, but what I have found so far is either related to hiding columns that you know are empty which I will not know or removing them in the SQL code which I think doesn't work if the column is called for in the gridview code and doesn't exist in the query.
When I click on the Alphabets it will show the details of a player...however, when that particular letters has no details of the player..I want to show."No results can be found"..Is there anyway to do it?
