Combobox selected value(selected item) binding in silverlight using c#

i have combobox in silverlight application..

                                                          

 <combobox fontweight="normal"
                                                          grid.row="1"
                                                          grid.column="4"
                                                          x:name="ddlservice"
                                                          dropdownclosed="ddlservice_dropdownclosed"

                                                          selecteditem="{binding path=servicename,notifyonvalidationerror=true, validatesonexceptions=true, updatesourcetrigger=propertychanged, mode=twoway}"
                                                          style="{staticresource comboboxstyle}">

i'm binding selected value or selected item combo box database..

but value not binded selected value or item combo..instead of showing selected value,it showing values once again..

code follows

if (ddlservice.items.count>0)
                                {
                                    if (ddlservice.itemssource!=null)
                                    {
                                        ddlservice.selectedvalue = servicename;//this name retrieved database..
                                        ddlservice.selecteditem = servicename;//this name retrieved database..
                                    }

}

the property of combo,updatesourcetrigger ,i have changed default,explicit , propertychanged..

then not getting binded value selected value.

any 1 me out resolve this.

thank you.

hi,

you should not bind servicename directly combobox.

here blog talked this,please try it:

http://www.microapplications.com/blog/archive/2009/05/07/330.aspx

if still have problems,please let me know.

best regards,

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