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Databinding Combobox

Posted on 2008-06-09
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Last Modified: 2013-11-26
Hi

 I have a combobox that I use databinding on.

Me.cboEmploymentCondition.DataBindings.Add(New System.Windows.Forms.Binding("Text", m_tbl_BindingSourceEmployed, "EmploymentCondition", True))

The problem is not if there are any data in the DB that matches the values in the combobox it's when it dosen't. If the data dosen't match any of the texts that's in the combobox it keeps the parent value.

So if I "send" "Test1" to the cbo it shows  "Test1" if this text is in the combobox.
If I then "send" "Test2" and that text dosen't exist in the cbo it will still show the text "Test1".
 If the text is missing I what the box to show a empty row (no text).

Is this possible to fix this?

I found this, but I can't get it to work
http://windowsclient.net/blogs/faqs/archive/2006/07/12/how-can-i-add-a-null-or-dbnull-entry-to-my-bound-combobox.aspx
/* Create a new Customer                          */
Customer cust = new Customer("Joe", null);
 
/* Add null value                                       */
DataRow row = statesTable.NewRow();
 
/* Enter a null row (ComboBox will show blank)          */
row["Name"] = "";
row["Code"] = DBNull.Value;
 
/* Add the row to DataTable                             */
statesTable.Rows.Add(row);
 
/* Bind the States ComboBox to the states DataTable     */
this.statesCB.DisplayMember = "Name";
this.statesCB.ValueMember = "Code";
this.statesCB.DataSource = statesTable;
 
/* Bind the ComboBox SelectedValue to the customer      */
/* business object                                      */
this.statesCB.DataBindings.Add("SelectedValue", cust, "StateID", true);

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Question by:AWestEng
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AWestEng earned 0 total points
ID: 21784740
Ok then I will try to answer the question myself.

What I can understand from all the stuff I bben reading is the problem a related to a known "bug" in the combobox that is the main problem.

If I use a DevExpress combobox is works perfect.
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