DropDownList Default Value As "NULL"?
Mar 5, 2010
I have Patient details form. From that I am storing the data to DB using Stored Procedure.In table, all fields are allowed null except Primary key.When I store data, then I will stored using .Text property.For non-mandatory field, if text box value is "" then it will stored, but in case DropDownList if I pass empty string ("") to DB then it will show me error as "Input string was not in correct format" Why?I have used DropDownList's SelectedItem.Text and SelectedValue . But in both case it show me the same error.Is there any case to pass default value of DropDown value as NULL?Note : I am using LINQ. (.NET FW 3.5) and SQL Server 2008.
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May 10, 2010
I have a dropdownlist on my view that is being populated from values in a database table and I've added a "--Select One--" header. Selecting a value from this list is optional (it maps to a nullable field in my table). Currently, if a user doesn't select a value from the ddl then it inserts an empty string into the field, wherease I'd prefer to keep it NULL.
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Sep 19, 2010
Very often i write code like:
<img class="hasMenu" src="<%= (Model.Image==null)?Url.Content("~/Content/NoImage.jpg"):Model.Image.standard %>"
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Is there any predefined function which could beauty this code? Something like: ValueOrDefault(Model.Image.standard,Url.Content("~/Content/NoImage.jpg"))
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Apr 22, 2010
i dont know how to set the field to blank field instead of null
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how to remove null value by default in mysql db.
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Oct 20, 2010
I'm used to using VB.net for web programming.Often, I have something like:
Dim s as string = Session("s")
I get a string value for s from the web session. If there is no value in the web session, I get a blank string.However, AFAIK, in C#, I have to have something like the code below to do the same thing.
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Nov 18, 2010
have a form where I insert record via DetailView control. I have some string fields. For each string field (nvarchar in sql) I have defined the Default Value in the SQL SERVER (2008) as ''. Also I have added to each InsertParameter of the DetailsView a DefaultValue="".Yet still, if the user enters no value for one of the string fields, NULL is inserted into the table.
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Sep 25, 2010
I have a databound dropdownlist, bound to an object datasource. I want to have a default value of "None" inserted at the top of the list and I would like to do this declaritively if possible. After much googling I came up with the below code. However it does not display my default item. I was under the impression that setting the AppendDataBoundItems to True would solve this, however it hasn't.
<asp:DropDownList runat="server" ID="ddl" DataSourceID="ldsCompany" DataTextField="CompanyName" DataValueField="CompanyId" SelectedValue='<%# Bind("CompanyId") %>' AppendDataBoundItems="True">
<asp:ListItem Value="DefaultValue" Text="DefaultText"/>
</asp:DropDownList>
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Jul 28, 2010
I am trying to set a default value for a dropdown from which i have an SQL datasource, heres my code:
<asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="SqlDataSource1" DataTextField="name" DataValueField="name"></asp:DropDownList>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="..." SelectCommand="SELECT [title_id], [name] FROM [tbl_job_titles]"></asp:SqlDataSource>
I tried adding this:
<asp:ListItem Selected="True" Text="All" Value="All">All</asp:ListItem>
but it didnt work..
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Jun 1, 2010
I have a dropdownlist that is being populated using linq. The code for linq is below
[Code]....
When the page is viewed the dropdownlist show the following;towels, shoes, etc. What I would like is the default item to be nothing. That is when the page is viewed then the drop down list should show something like this "select category". Right now it is starting by showing towels, which is quite irritating, since if I want to see towels I first have to select something else and then go back and select it!
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Jul 9, 2010
I have a dropdown list which I bind through a datasource. How can I inject a default value to it? My db doesn't have a default value and changes are not permitted!
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Nov 23, 2010
I have a field that is a DropDownList. When in the insert mode I want that field to be blank - It currently is displaying the first record in the table it pulls from. I was expecting to see an initial value setting in the DropDownList properties but do not. For example - suppose I have a field named locations that consist of 4 location (below). In "Insert" mode, location currently displays Dallas. I want it to be set to blank initially and the user select one. What am I mssing?
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Mar 28, 2011
i want the code to disable default selection in dropdownlist in asp.net and also on selection of a particular data field the values are displayed in the txtbox below.the dropdown should be filled with system related data like eg c:drive, d ... etc dynamically at run time.
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May 3, 2012
I have dropdownlist i want in my DDL before selecting item show some text:
Like this
Please select city
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Mar 9, 2011
I have several pages linked together that I want to maintain drop down selections for. I've seen a number of ways to do this with session values, etc, but I want to set the default value while still having the option of selecting other values.
Effectively, users will make selections on page 1 and then on page 2 they will use those same selections, but also potentially want to change their selections. My thought was that I could load the selections into a table in SQL in page 1 and then in page 2 call that table and set the values as variables. My question, then, is how I would set the default dropdown value to be a variable as opposed to a set value.
I am using VisualStudio2010 with ASP Webforms using C#.
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Jan 11, 2011
I have a dropdownlist that is not bound to a datasource, I have hard coded a few items in the list cause the list is always constant and will never grow and there are only 4 entries init. Anyway, after i load the page and make a selection from the dropdownlist and do a postback, the dropdown always returns to the default selection...which tells the users to make a selection.How do I get the dropdown to keep the selected value after the postback? I want to be able to display the selected value all through until another selection is made.
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May 7, 2015
dropdown list keep giving value -1 even i choose one of it already. tell me where i was doing wrong?
this is my code
<asp:DropDownList ID="ddl_viewer" runat="server">
</asp:DropDownList>
this is my vb code
Protected Sub LoadViewer()
ddl_viewer.DataSource = SQL_Viewer()
ddl_viewer.DataTextField = ("view_group")
ddl_viewer.DataValueField = ("view_ID")
ddl_viewer.DataBind()
ddl_viewer.Items.Insert(0, New ListItem("-- Choose --", "-1"))
[Code]......
this is my class
Dim sqlCmd As SqlCommand = New SqlCommand("Insert_News", ClsDBConn.GetDBConn)
sqlCmd.CommandType = Data.CommandType.StoredProcedure
Dim sqlParameter As SqlParameter
sqlCmd.Parameters.Add(New SqlParameter("RETURN_VALUE", SqlDbType.Int))
sqlCmd.Parameters("RETURN_VALUE").Direction = ParameterDirection.ReturnValue
[Code]......
and this is my stored procedure
ALTER PROCEDURE [dbo].[Insert_News]
-- Add the parameters for the stored procedure here
@News_Title VARCHAR (500),
@News_Viewer VARCHAR (500),
@News_Message VARCHAR (300),
@News_Author VARCHAR (100),
[Code]...
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Sep 28, 2010
I have some code which fills a dropdownlist:
pn.DataSource = Datatbl.Tables["datalist"];
pn.DataValueField = "partnumber";
pn.DataTextField = "partnumber";
pn.DataBind();
pn.Items.Insert(0, "");
pn.SelectedValue = ligne["pn"].ToString();
and when the value in the Database in null (""), it throws this error: ArgumentOutOfRangeException: 'pn' has a SelectedValue which is invalid because it does not exist in the list of items. Parameter name: value
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Jan 8, 2010
I'm currently stuck with a problem with MVC2 RC and validation on a dropdownlist :
I have a page with some fields and a dropdownlist. The dropdownlist is not a mandatory field so I would like to save a null value into my property.
Unfortunately, I can't validate my page with a null selected value, because when I look into the modelstate just on the first line of my action, I've already an error telling me I must choose an item.
Is it normal working of dropdownlist validation or is it a bug ?
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Sep 2, 2010
Note: The following is just an example.
I'm pretty new to ASP.NET MVC and I'm trying to get my head around how validation of dropdown lists work. I have the following property in my ProfileViewModel class:
[DisplayName("Gender")]
public bool? Gender { get; set; }
null is meant to mean "unknown", true female and false male. In the view model constructor I
AllGenders = new List<SelectListItem>(2)
{
new SelectListItem {Text = "Unknown", Value = "null"},
new SelectListItem {Text = "Male", Value = "false"},
new SelectListItem {Text = "Female", Value = "true"}
};
First of all, it seems that I have to use strings when populating a List<SelectListItem>, which feels kinda weird. Is this really how it's done?
Secondly, when I choose "Unknown" in the list the validation fails telling me:
The value 'null' is not valid for Gender.
Why is that? When I remove the "null" option and change Gender to a simple bool, everything seems fine.
This is the ASPX:
<%= Html.DropDownList("Gender", Model.AllGenders) %>
(I can't get DropDownListFor to work correctly and it seems that many others have the same problem.)
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Jan 11, 2010
what i have a is a dropdownlist and what i have done is set the datasource to be "select top 10 * from Orders"I have only displayed the OrderID , CustomerID and the Freight i would like to display in a dropdownlist. But what is happening is that for all 10 rows the dame value in the dropdownlist is shown. The dataset that is bound to the dropdownlist initially is all that items in the database.i would like the freight for that particualar Orderid to be displayed even if it is lets say item number 5 in the dropdownlist or itemn number 2 .
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Oct 11, 2010
The intension is to get the all text file names in the drop down present in a particular location. When a user selects any filename from the drop down, it will show the data which is in that particular text file in a GridView.
I've done both the steps and it's almost complete but i stuck on a small issue. Probably because of non-usage of ASP.NET for a long period of time. The problem is, the drop down only selects the default value not other values.Here's my code for DropDown Selected Index Change
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
DirectoryInfo di = new DirectoryInfo(@"C:myLogs");
[code]....
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Jul 18, 2010
For my ASP.NET page, in the code behind I load various items/options into a DropDownList but I do not set a default by assigning SelectedIndex. I notice for the postback SelectedIndex is set to 0, even if I never set focus to or changed the value in the DropDownList.
If not otherwise specified in the code behind or markup, will a default value of 0 be used for the SelectedIndex in a postback with a DropDownList? If yes, is this part of the HTML standard for selection lists, or is this just the way it is implemented for ASP.NET?
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Jul 8, 2010
I have a form in which I have a gridview with a LinkButton culumn in which when the user clciks a modal popup extender shows up. In the modalpopup I have a dropdownlist which is filled from DB in code behind. but when the user clicks on Add button in modalpopup panel, the selected value of the dropdownliast is always its default value.
[Code]....
here is my code behind:
[Code]....
I traced my code behind, the fillData() which fills up dropDownList is called only once in page load's first time.
PS. I understood the problem exists only when the modal is poped up by linkbutton click of gridview. when It is poped up by a button outside the grid it workes fine.
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May 7, 2015
I used below code to set default value for DDL
state.Items[1].Selected = true;
now I use cascading for DDL how I can same thing for cascading?
<cc1:CascadingDropDown ID="CDLdistrict" TargetControlID="DDLDO" PromptText="All"
PromptValue="" ServicePath="../ServiceCS.asmx" ServiceMethod="GetDistrict" runat="server"
Category="District" ParentControlID="DDLzoneO" />
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Dec 27, 2011
URL....If in the dropdownlist before making selection if i want to display like this -----Select a city------How can i do it?
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