[Solved] Unable to read RadComboBox selected item

[Ken]

I am loading four RadComboBoxes with months and years with a simple example I found on your website.  They render just fine in the browser with all the months and years but I cannot read the selected item value from the code-behind.  I load the RadComboBoxes here:

{
            int startYear = 2003;
            DateTimeFormatInfo dtfi = new DateTimeFormatInfo();
            RadComboBoxItem riMs = new RadComboBoxItem();
            riMs.Text = "Month";
            riMs.Value = "Month";
            RadComboBoxItem riMe = new RadComboBoxItem();
            riMe.Text = "Month";
            riMe.Value = "Month";
            RadStartMonth.Items.Add(riMs);
            RadEndMonth.Items.Add(riMe);
            for (int month = 1; month < 13; month++)
            {
                RadComboBoxItem ris = new RadComboBoxItem();
                ris.Text = dtfi.GetMonthName(month);
                ris.Value = dtfi.GetMonthName(month);
                RadStartMonth.Items.Add(ris);
                RadComboBoxItem rie = new RadComboBoxItem();
                rie.Text = dtfi.GetMonthName(month);
                rie.Value = dtfi.GetMonthName(month);
                RadEndMonth.Items.Add(rie);
            }
            RadComboBoxItem riYs = new RadComboBoxItem();
            riYs.Text = "Year";
            riYs.Value = "Year";
            RadStartYear.Items.Add(riYs);
            RadComboBoxItem riYe = new RadComboBoxItem();
            riYe.Text = "Year";
            riYe.Value = "Year";
            RadEndYear.Items.Add(riYe);
            for (int year = startYear; year <= DateTime.Now.Year + 1; year++)
            {
                RadComboBoxItem riYYs = new RadComboBoxItem();
                riYYs.Text = year.ToString();
                riYYs.Value = year.ToString();
                RadStartYear.Items.Add(riYYs);
                RadComboBoxItem riYYe = new RadComboBoxItem();
                riYYe.Text = year.ToString();
                riYYe.Value = year.ToString();
                RadEndYear.Items.Add(riYYe);
            }
        }

When the RadComboBox item is selected by the user and clicks the submit button ALL references to RadStartYear.Text, RadStartYear.SelectedValue, etc. are null. 

What am I doing wrong here?  Am I missing something?

Please do not ask me to send a sample project.  My project is very large and I have sent it to you before and you could not work with it.  I have read all your documentation and examples and do not see what I am missing.

Please just kindly answer my above question.

Thanks much,
Ken

[Ken]

Important addition to my post - I am not using a 'Button' as I described previously.  I am clicking an item in the RadMenu which is calling my same program with a query string (Dashboard.aspx?Channel=8). 

When I click a button on the page the RadComboBox items are present.  But when I click the RadMenu link my RadComboBox items are all null in the code-behind. 

Is there a way to make the RadComboBox items persist when I click the above link from the RadMenu?

Thanks much,
Ken

[Nikolay]

Hello Ken,

I suppose that the problem appears because you redirect to another page holding the combobox and the selected item is lost. I suggest that you pass the text (or value) of the selected item to the QueryString, find the item in the page_load event of the newly loaded page by using the QueryString parameters and select the item.

This should solve the problem.

Sincerely yours,
Nick
the Telerik team

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