Web Forms :: Can Bind A DropdownList To A Dictionary Object Directly On The Page

Mar 17, 2011

I've got a Dictionary<string, string> object I'm creating:-


and I wanted to bind this to a dropdownlist. I know this is possible in code-behind, but is it possible to do this directly on the asp: control, something like

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I was wondering why this doesn't work:

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DataTextField="Value.DisplayName" />

Code Behind

var d = new Dictionary<int, MailAddress>();
d.Add(0,new MailAddress("foo@bar.com", "Mr. Foo");
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I end up with a row for each object in the list, and any cell in a given row is bound to a property of the corresponding object.

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Is it possible to automatically bind a Dictionary to a Gridview? The closest I've got is:

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I'm binding a Dictionary to a drop down list.

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Sep 30, 2010

I have a class object which is basically kind of hierarchy and looks like this when I convert that to XML.


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Now I need to update <quantity> value where <sku> = "SKU 2", remember this <sku> can be anywhere in hierarchy, so I need to update its <quantity> value where <sku> = "SKU 2".

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Forms Data Controls :: How To Extract Value From A Dropdownlist After Bind 7 Column Name In A Dropdownlist

Mar 29, 2011

I have a table and 7 column name.

I bind the 7 column name in one dropdownlist.

Now the problem is,how do I extract the data value in a dropdownlist?

For example,

Dropdownlist contain 7 column name








when I click the subject_name,I want it to appear in a gridview



Below is my current codes which I have a problem.

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
SqlConnection conn = new SqlConnection("Data Source= EN\SQLEXPRESS;" + "Initial Catalog=ms;Integrated Security=SSPI");
SqlDataAdapter adapSel;
string mySQL = "SELECT '" + dd_list.SelectedValue+ "' FROM examtimetable ";
adapSel = new SqlDataAdapter(mySQL, conn);
DataSet dsSel = new DataSet();
GridView1.DataSource = dsSel;
Previously I have bind 7 column name in my dropdownlist
protected void Page_Load(object sender, EventArgs e)
if (Page.IsPostBack == false)
SqlConnection conn = new SqlConnection("Data Source= EN\SQLEXPRESS;" + "Initial Catalog=ms;Integrated Security=SSPI");
SqlCommand sqlCmd = new SqlCommand("select column_name from information_schema.columns where table_name='examtimetable' and COLUMN_NAME not like '%ID'", conn);
SqlDataReader ds;
ds = sqlCmd.ExecuteReader();
dd_list.DataSource = ds;
dd_list.DataTextField = "Column_Name";
dd_list.DataValueField = "Column_Name";
dd_list.Items.Insert(0, "Select Option");

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Web Forms :: Nested Dropdownlist Ondatabound => Bind Other Dropdownlist Fail

Dec 9, 2010

I have a gridview with 3 nested dropdownlists in one cell on edit like this:To get the exact fields when the user clicks on edit I used the following code(yes it's messy)


The BLLOnderhoud is a class and the getReserveInfo is used to get the Model - Brand(merk) Information.Since the dropdownlists are nested in the gridview I can't call them directly and they can't call any of my functions.And this is the problem, when I change the dropdownfield Model the Auto field wich is the last dropdown(in the picture is a typo) should be binded like in the following code:


But the dropdownlist onDataBound event can't call any of my functions that are in my class.So my question is how can the onDataBound event of the second dropbox trigger a function? The only thing that the function has to do is to bind the 3rd dropdownlist

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Binding Dictionary To DataTextField Property Of DropDownList

Oct 29, 2010

I have a State class defined like this:

Public Class State
Public Property StateId As Integer
Public Property Name As Dictionary(Of Integer, String)
End Class

Name(x) contains the state name in different languages. I get a collection of State from the method StateManager.GetAllStates() and I want to bind this collection to a DropDownList. The problem is that I can't find how to set the DataTextField property to let's say stateList.Name(1) which is the english name of my state.

Dim stateList As StateCollection = StateManager.GetAllStates()
Me.DataSource = stateList
Me.DataValueField = "StateId"
Me.DataTextField = "Name(1).Value" <-- Problem here

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Web Forms :: Dropdownlist.items.findbyValue(value) - Getting Object Reference Not Set To An Instance Of An Object

Jan 13, 2010

I am trying to use


with values I get from a database but I am getting Object reference not set to an instance of an object.

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Web Forms :: DropDownList FindByText - Object Reference Not Set To Instance Of Object Error

Jul 12, 2013

In manager.aspx page I have gridview that bind product information from database in this gridview I define linkbutton EDIT that when users click on it they go to Edit.aspx page and in this page users can see their product information and Edit them

In Edit.aspx page I use some textbox and dropdownlist and bind them from database

int data1 = Convert.ToInt32(Request.QueryString["Id"].ToString());
SqlCommand _cmd = new SqlCommand("viewProduct", _cn);
_cmd.CommandType = CommandType.StoredProcedure;
_cmd.Parameters.AddWithValue("@id", data1);
SqlDataReader _dr = _cmd.ExecuteReader();

[Code] ....

When I click on EDIt linkbutton from gridview it go to Edit.aspx page and bind all  data from database and ofcourse show data in Dropdownlist untill now every thing is ok

but when I change some Item in this page i.e Name of product when I changed and clicked on button to update table in database it update data in database but below error happen too

Server Error in '/behtop website' Application.

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

Source Error: 

Line 79:
Line 80:
Line 81: DDL1.Items.FindByText(_dr["classification"].ToString()).Selected = true; Line 82: DDL2.Items.FindByText(_dr["subset"].ToString()).Selected = true;
Line 83:

And when I back to manager.aspx and again click on Edit linkbutton to Edit that product it didn't load Edit.asp page and above error happen again...

This error happen just when I want edit product information in other time if I don't edit any thing edit.aspx page load successfully...

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