Web Forms :: Validating DropDown Bound To Linq To Sql?
Jul 19, 2010
i want to validate dropdownlist which is bound to objectdatasource. i am using following code but the listitem <asp:ListItem Value="-1">Select</asp:ListItem> doesnot appear. it shows only items that are stored in database. please help me how can i validate this dropdownlist.
I have two dropdowns in the footertemplate of my gridview inside a usercontrol.
I also have a button "btnADD" inside the footer template. I am using the footertemplate to add a new row to the grid.
What do I do to validate on Button_click event for 'btnAdd' if a value is selected in the dropdown other than "select.." which I dynamically add in rowdatabound event?
I have this javascript function that I wanted to implement, but it gets called in the Page_load event rather than the button click event and gives an error.
The javascript function that I need to call is this: ( I created a method to return a string to use it in regards to RegisterClientScriptBlock, but do not know exactly how to use it)
I'm following along with Nerddinner making a few changes, and can't figure out why my Create form is not validating. I'm using Linq to SQL and trying to use Modelbinding to map my form data automatically. Using the code below, I do not receive any validation errors on the page, but can't make it past my try{} block. When unhandled, the error I receive tells me I'm unable to insert a Null value for "basetype". This is correct based on Database constraints, but why am I receiving exceptions, and not the nice red error messages and validation?
I have a dropdown binded with database value Eg : A001, A002, A003 etc. When ever i use to select the first value A001 , it is not going for postback. After selecting the second index value A002 n then selecting the first value A001 , i use to post back. And i dnt want to use appent data bound here.
I am struggling to create a webservice method using LINQ technology and to populate a dropdown in a form. Here is the Webservice code.
[WebMethod]
public string[] GetAllCountries() { LinqClassesDataContext db = new LinqClassesDataContext(); var q = from c in db.ListContinents()select c; return q.ToList() ; }
And here is the form code behind
protectedvoid Page_Load(object sender, EventArgs e) { WSClass WS = new WSClass();//bool ds = WS.GetAllCountries(); var v = WS.GetAllCountries(); ddlContinent.DataSource = v; ddlContinent.DataBind(); }
I have a bound dropdown list populated with a table of names through a select, and databinding. it shoots selectedindexchanged that (through a postback) updates a certain gridview.What happens is, since it runs from changing the index, the one that always comes selected (alexander) can only me chosen if you choose another one, then choose alexander. poor alexander.What I want is to put a blanc option at the beginning (default) and (if possible) a option as second.I can't add this option manually, since the binding wipes whatever was in the dropdown list and puts the content of the datasource.
consider the following scenario. I have 2 tables namely mtblExp and mtblRevenue. the tables are given below
mtblExp
Cost_Code month Expenditure C001 April 2010 100 C002 May 2010 200 C003 June 2010 500 C001 July 2010 600
mtblRev
Cost_Code month Revenue C002 Jan 2010 200 C001 April 2010 500 C005 July 2010 600 C002 Nov 2010 100
Now when a user select the month range from Jan 2010 to Nov 2010, a dropdown list should be bound with C001, C002, C003, C005.Can anyone sugest an Sql query for this..the query that i am using is given below
[Code]....
this is working...but i am not sure if this is the right way.
I have added a partial class to one generated by the Entity Framework. I wanted to add a calculated field that I could bind to my GridView. However, when I try to access the new property, I get an error message that this is a limitation to Entity Framework.Are there any work arounds to accomplish this?
I've tried to wrap up my problem with a complete example below - the original problem is part of a jQuery plug-in that I'm writing to extend the behaviour of an ASP.NET ajax application I already have.
The aspx page below has one drop down list which is marked for auto post back. I've also bound a change event using jquery (which ultimately I will swap for a .live() event to maintain the binding after the update panel refresh.) The problem is, when the jQuery event is bound I see two ajax begin requests and page_loads fire but only one ddlTest_OnselectedIndexChanged event. One of the page loads is malformed too - the content-length states it's about 300 bytes long whilst the totalBytes is 0 and form data empty. This does not happen if I bind to the click event of a button.
An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
I am use the new ASP.NET MVC 2 and Entity Framework, but when I try to create a new view with strongly-typed option selected, the entity objects is not appears at dropdown and I cannot use the view creation wizard. I recompile the solution, but still not appears yet. Have any workaround that I forgot to do to enable the entities to be displayed at dropdownlist ?
I have a small issue binding the values into a dropdown using LINQ in ASP.NET code-behind.
var clientquer = from i in Entity.New_Bank select i; //var q = (from s in names // select s).Distinct(); // var getlendername = (from db in mortgageentity.New_Lender group db by db.Bank_Name into t select t.Key).ToList(); if (clientquer.Count() > 0) { ddlbankname.DataSource = clientquer.ToList(); ddlbankname.DataValueField = "Bank_ID2"; ddlbankname.DataTextField = "Bank_Name"; ddlbankname.DataBind(); }
It is binding with duplicate values, but I don't want bind duplicate values. I'm trying to solve this by using a group by clause, but it is not working.
I am wondering into the unknown field of OOA and was looking for a way to separate my business logic from my UI. A small example is as followed:
Two DropDowns where the second one is depended on the selection in the first DropDown. You have Cars, planes, etc. inm the first DropDown and Toyota, Chrysler, etc in the second (depending on the value in the first DD.I have som Lin syntax. The file is situated in the App_Code folder and NOT as code behind. [Code]....
I would like to know how i can make populate my second Dropdown list with results. At this point it's just putting in the complete ProductSubCategory.
I'm new to Linq. I have searched and searched the web for a soluion, and can't find anything. I have a Linq query and I want to insert a row ("Select User") to the top before I pass it to the drop down list. I've been trying to use the Union but to now avail (it keeps telling me that my object doesn't support the Union method). My code, prior to attempting to inser a row, is very simple.
public SelectList DropDown_Users() { var context = new VivarianDataContext(); var query = from t in context.AspnetUsers select new { t.UserId, t.LastName }; list = new SelectList(query.AsEnumerable(), "UserId", "LastName"); return list; }
Now I try to insert a row and I found this on the internet and it seems to say that his solution will work. But it is filled with syntax errors. [URL]
I tried to implement it using the following code, but it doesn't compile.
public SelectList DropDown_Users() { SelectList list; //get the original data var context = new SQL2005633131VivarianDataContext(); var query = from t in context.AspnetUsers select new { t.UserId, t.LastName }; //create a dummy table with an empty row var AllUsers = new List<AspnetUsers>(); var BlankUser = new AspnetUsers() {UserId=System.Guid.Empty, LastName="Select One"}; AllUsers.Add(BlankUser); //use Union to join the data - ERRORS HERE var newTable = AllUsers.Union(query); list = new SelectList(newTable.AsEnumerable(), "UserId", "LastName"); return list; }
I use an asp Login control with WebControlCaptcha as shown in the above code. The problem is that the captcha control always returns false when UserValidated method is called. I tried to use captcha control on another webpage without the login control it works.
Does anyone know how to do this so when I select something the 1st dropdown and the 2nd one becomes visible and populates list from a Select statement. I really need help on how to do in an aspx and not on the code behind page.
I Have the gridview control with 2 dropdown list and 2 text boxes,When the textbox chnaged event happen 1 row will create and the dropdown back to initial values( its not retaining the selected values),I am binding the control after text changed method,Is there any properties needs to be set or any other way we can retain the values in postbacks?
I have a gridview where i have two fields. one is product and second is sub category.
I need to do 2 things.
1. I need to populate the two combos from the database. But depending what is selected in dropdown 1 this will determine what needs to be populated in drop down 2?
I have two dropdown linked with sqldatasources.When I select item in ddl1 then on the basis of selection ddl2 is being loaded.Is there any possiblity that if I select ddl2 then ddl1 will also load on the basis of selection?
I can't seem to get any sort of validator to fire when validating my DropDownList. I just want to make sure that it isn't left at "--Select--" when the user presses the Add button on the page. I've tried a range validator and required field validator and neither seem to fire at all. My DropDownList contains ID which is an int that is hidden and Name which is a string that is displayed. The ID is -1 for "--Select--". I use these all the time and can't understand why the page in this new solution is any different from other solutions I have done in the past. What have I missed?
I have 2 text boxes one for first name and one for last name. If the user enters a first name then the last name cannot be empty. Is there a validation control i can use and how can i display the message in the validation summary.
