I want to cancel the value changed Event based on certain condition.

• based on certain condition i popup one message box with Yes or No Option.
• If user selects No. I need to cancel the event.
• I have stored previous value in some variable.
• I reset the previous value into combo.
• Messagebox comes twice. That means, the event fires two times.

         If i choose value from the dropdown, then it is ok. But if i type value in the dropdown, then that message comes twice.

What can i do for this? Is any otherway to handle this scenario?

UltraCombo Property:

• AutoCompleteMode - Append
• DropDownStyle - DropDown

Event Fired:

• ItemNotInList - (For Inserting new value into the database)
• ValueChanged - (For canceling event based on certain condition)

Sample Code 

private void ifgCboTest_ValueChanged(object sender, EventArgs e)

{ 

try

{

if (_isFromValueChanged) 

 return;  

if (ifgCboTest.SelectedRow != null )  

{

UltraGridRow ugRow = ifgCboTest.SelectedRow;  

if (ugRow.Cells["Desc"] != null && ugRow.Cells["Desc"].Value != DBNull.Value && !string.IsNullOrEmpty(ugRow.Cells["Desc"].Text.Trim())) if (!string.IsNullOrEmpty(ifgtxtNotes.Text.Trim()))

{

{ 

DialogResult dlg_Result = MessageBox.ShowMessageBoxYesNo(Resources.Messages.TestDetail, "Continue.It will overwrite existing description", global::Utils.MessageBoxExLib.MessageBoxExIcon.Question);  

if (dlg_Result == DialogResult.No) true;  

{

_isFromValueChanged = 

//ifgCboTest.SelectedRow = null; 

if (_oldID > 0) 

Utils.SetValueForCombo(_oldID, ifgCboTest);  

else

ifgCboTest.SelectedRow = null;

_isFromValueChanged = 

return;  

}

} 

}

//TODO }catch (Exception exifgCboTest_ValueChanged)

}

{

}

finally

{

if (!_isFromValueChanged)

{ 

if (ifgCboTest.SelectedRow != null) Convert.ToInt32(ifgCboTest.Value);  

{

_oldID = 

}

else

_oldID = 0;

}

}