C#: DataBase Null In RadioButtonList?

May 7, 2010

I would like to have a radiobuttollist were you can select value null.

Something like this:

[code]....

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I have a radiobuttonlist inside a datalist itemtemplate and i need to bind the radiobuttonlist dynamically from database I have tried to bind it inside itemdatabound event of datalist but it the result is always duplicated according to the fields in teh database.

for more information:

the database has two columns one for questions and the other is for choices , for the first question with id lets say 1 there are 4 choices, when the radiobutton is binded the result appears to be 4 times duplicated ?

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Feb 10, 2010

In my database table I allow null for the gender field. However, when the form is being edited, it gives me an error since the RadioButtonList does not have a match value for null. How do I get around this? Is there a way to have null value in the RadioButtonList control?

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Web Forms :: Populate RadiobuttonList From Database?

Sep 22, 2010

I am using:

[code]....

This solution doesn't work though. It doesn't leave the option of choosing anything from the list. Plus I would like it if it were a Radiobutton instead of a Dropdown. The field in the database is varchar(50).

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I've two RadioButtonLists which pulls "fullName" and displays, the idea is for the user to select from RadioButtonList1 and RadioButtonList2 then submit the data.

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I've a SqlDataSource, 2 RadioButtonLists and some code binding it:

[Code]....

Also when I go to select just one record from RadioButtonList and submit the data, it returns errors because it sees it as submitting null values.

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Aug 11, 2010

rbl.DataSource = ds;

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I have a web form(C#) which has many radiobuttonlist controls. For each control there is a corresponding field in a sql server database table. And finally there is a submit button.

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Save Radiobuttonlist Data Into Database When They Are In Disable Position?

Sep 14, 2010

iam using 2 radio buttonlist controls in web application

they are

FIRST Yes No
SECOND Yes No

Initially SECOND radio button list is in disable position.

when i was click on yes of FIRST radio button list, then SECOND radio button list is enables otherwise it is in disable mode only.

here my problem is when i am inserting data into the database the disable radio button list gives error as

System.NullReferenceException: Object reference not set to an instance of an object.

code written for inserting is

protected void Button1_Click(object sender, EventArgs e)
{
SqlConnection con = new SqlConnection(@"Data Source=STS2SQLEXPRESS;Initial Catalog=STS;Integrated Security=True");
string sql;
sql = "insert into Table1(";

[Code]....

i want NULL value if i am not select SECOND radio button list

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I have a gridview with a RadioButtonList I need to populate. It is as such"

[code]....

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I use below code for binding CheckBox  from database

if (_dr["Radiator"] != null && _dr["Radiator"].ToString() != "") {
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I want bind RadioButtonList from database like above how I can do it?

<asp:RadioButtonList ID="RBL1" runat="server" RepeatDirection="Horizontal">
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<asp:ListItem Text="South" Value="South"></asp:ListItem>
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Forms Data Controls :: Setting Selection In RadioButtonList According To Data From Database

Dec 23, 2010

I try to set the selection in the radiobuttonlist accordingly to data retrieved from the database.

This is not working (the mydata.gender contains "Mail")

mygender = myfatality.gender

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Suppose if i fethed 20 records then 20 radio button lists should be generated.

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i want parse null value and disable checkbox in form view how can i do that that's my current code:

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MVC :: Instead Of Null, The Model Inserts A 0 Into The Database?

Aug 3, 2010

I have a group of radiobuttons. The field they are 'bound' to is of datatype tinyint (sql server), byte .NET. It is set to NOT accept nulls in the database column (col1) and no default value has been set for the column, or indeed, anywhere else.

View code as follows:

<ul> <li><%= Html.RadioButton("col1", "1")%></li> <li><%= Html.RadioButton("col1", "2")%></li> <li><%= Html.RadioButton("col1", "3")%></li></ul><%= Html.ValidationMessage("col1", "*") %>

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However, instead of null, the model inserts a 0 into the database. As this does not fail, no error is raised.

I am not setting the default value to 0 anywhere, not in the mvc app or the database

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my table field allows null values. but my code below does not work unless a value is assigned to my variable even though the glable variable is initialised to 0; tried the DBNull.Value - still, it gives me error as the table in question is linked and expecting a value.

[Code]....

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I have build a usercontrol in asp.net, and there is a property like the following.

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[code]....

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I have a datareader like so but when it encounters a NULL database value, I get the error message "Conversion from type 'DBNull' to type 'String' is not valid."

Dim myReader As SqlDataReader = myCommand.ExecuteReader()
Dim yValues As New List(Of Double)
With myReader
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I am using NLog for logging in an ASP.Net application and making use of the database target with Microsoft Sql Server.I have some logging parameters that are optional and not always specified. I would like these to be written as null when they are not provided, however NLog seems to always write them as empty strings.

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Ref: http://nlog-project.org/wiki/Database_target

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Method Invoked When A Gridview Records From Database Are Null

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I have a gridview which uses a stored procedure with session["UserName"] as a parameter to retrieve the records from the database.

Here is the code for that gridview Sqldatasource:

[code]....

lets say a particular user who has logged in doesn't have any records in that table on which this particular stored procedure is being executed. Then there won't be any records associated with gridview. So in this scenario: is there any method that gets executed or some exception is thrown, so that i can explicitly use that method/exception/property to display a message Label to the user like "No records to show !!"

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