Selection out of range in Telerik RadComboBox

Question

I have Telerik RadComboBox ,

    <telerik:RadComboBox runat="server" ID="comboTown" Width="150px">
    </telerik:RadComboBox>

And I bind this table

Town
-----
TownOne
TownTwo
TownThree
TownFour

to comboTown show as below

  comboTown.DataSource = DB.Towns.ToList();
  comboTown.DataTextField = "Town";
  comboTown.DataValueField = "Town";

But , when I set selectedValue for comboTown likes comboTown.SelectedValue= "TownTwo";

I get this error message
Selection out of range Parameter name: value

I want to know why , what am i doing wrong?

score 1 · Answer 1 · answered Apr 25 '13 at 05:55

1

Before

comboTown.SelectedValue= "TownTwo"

add code

comboTown.DataBind()

answered Apr 25 '13 at 05:55

Eugene

325
1
5

Can you post your code here, or you can try using: SelectedIndex instead of SelectedValue – Eugene Apr 25 '13 at 06:27

score 0 · Answer 2 · answered Apr 25 '13 at 18:30

I just tried this and it worked for me :

Mark Up:

<telerik:RadComboBox runat="server" ID="comboTown" Width="150px" />
<telerik:RadButton runat="server" ID="btnSetSelectedValue" 
 OnClick="btnSetSelectedValue_Click"></telerik:RadButton>

Code:

 protected void Page_Load(object sender, EventArgs e)
 {
    if (!IsPostBack)
    {
       comboTown.DataSource = new List<string> { "TownOne", 
                                                 "TownTwo", 
                                                 "TownThree", 
                                                 "TownFour" 
                                               };
            comboTown.DataBind();
    }
 }

 protected void btnSetSelectedValue_Click(object sender, EventArgs e)
 {
        comboTown.SelectedValue = "TownThree";
 }

As you can see - I have a combo box. On page load if it is not a postback I bind it to values. I have a button and on click of button I do a postback and set a selected value on combo box to "TownThree". This worked for me.

Selection out of range in Telerik RadComboBox

2 Answers2