problem with providers in RADMAP

[Krystyna]

after the last published version of telerik libraries I have a problem with the radmap control.
Before I was able to add providers by programming in behind code (radmap.providers.add ...), now I have a problem(nothing change in code only dlls telerik) and it crashes my applications. When adding provider to a control, radmap gets "Invalid input string format" error
I used this method because I change the url in the provider and in order to refresh the content of a given provider I had to delete it earlier and add it soon.

my provider base on UriImageProvider.

before last version of telerik i had and worked url of provider for example:  "http://server:port/arcgis/rest/services/test/MapServer/export?bbox=23.4333229064942,52.1333826707921,23.8082803998675,52.0174907373669&size=2184.28571428571,1098.42857142857&imageSR=3857&format=png&transparent=true&dpi=96&dynamicLayers=%5b%7b%22source%22%3a%7b%22type%22%3a+%22mapLayer%22%2c%22mapLayerId%22%3a+44%7d%2c%22drawingInfo%22%3a%7b%22showLabels%22%3a+False%7d%7d%2c%5d&f=image"

now its problem

how to update my provider after add to radmap?

Is there currently another way to add provider and change the url in the provider and refresh on the map?

How to display image from arcgis server which provider i have to used ?tilemadsource,imagemapsource,UriImageProvider maybe another?

[Krystyna]

solved: i have to html.decoded becouse i have spacial chars