Home / Community & Support / Developer Productivity Tools Forums / WinForms > ComboBox and ListBox (obsolete as of Q2 2010) > RadCombobox SelectedIndexChanged fire when program add DataSource property

• Avelyn Teh

  Posted on Sep 19, 2011 (permalink)

  Dear All,
  
  I have 2 Radcombox
  Radcombox1 will bind data in Form_Load event  And  Radcombox2 will bind when user selected item at Radcombox1
  
  This is my code in Form_LoadRadcombox1.NullText = "- Select Name -"

  Radcombox1.DisplayMember = "Name"

  Radcombox1.ValueMember = "ID"

  Radcombox1.DataSource = dataTable

  Radcombox1.SelectedItem = vbNullString

  
  My problem is when add DataSource to Radcombox1 (Radcombox1.DataSource = dataTable)
  the Radcombox1_SelectedIndexChanged event is fire and it's also binding Radcombox2.
  
  Please suggest how to make it Binding Radcombox2, only when user selected Item at Radcombox1.
  
  Thanks and best regards
  
  
  *question re-post from TrialUser
  

  Reply

• Peter Peter

  Posted on Sep 21, 2011 (permalink)

  Hi Avelyn Teh,

  Тhis a normal and expected behavior, because the DataSource changed the current position to 0, so the event should be fired. You can workaround this with a BeginUpdate/EndUpdate block:

  Radcombox1.NullText = "- Select Name -"Radcombox1.DisplayMember = "Name" 

  Radcombox1.BeginUpdate() 

  Radcombox1.ValueMember = "ID" 

  Radcombox1.DataSource = dataTable  

  Radcombox1.SelectedItem = vbNullString 

  Radcombox1.EndUpdate()

  I hope it helps. If you have any further questions, do not hesitate to contact me.
  
  Best wishes,
  Peter
  the Telerik team

  Explore the entire Telerik portfolio by downloading the Ultimate Collection trial package. Get it now >>

  Reply

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Home / Community & Support / Developer Productivity Tools Forums / WinForms > ComboBox and ListBox (obsolete as of Q2 2010) > RadCombobox SelectedIndexChanged fire when program add DataSource property