Created calendar user control but not working when used twice in sharepoint webpart

See more:

SharePoint2010

please help me for this.

I have created calendar control and used it 2 times in a webpart but its not working properly. how can I use the same control multiple times?

In my webpart i used below steps:

The custom controls added two times in webpart and named them as strDt1 and strDt2
Click on strDt1 control, below the textbox calendar will appear
Select date and the date will appear in strDt1’s textbox
Now click on stDt2 control
Calendar will appear below the strDt1 control
Select the date and the date will appear in strDt1’s textbox