Thanks to all for taking your time and trying to help me.
Initially I thought it might be the issue of Usercontrol and DropDownList.
However, after deeper exercise, I could succeed in getting control of the DropDownList.
The Error was in:
The coders had used Property for assigning value to DropdownList and to retrieve value.
Though the retrieval part was working fine, the assigning part was screwing the process. I changed it and now it is working fine.
The Property code where issue was there:
public string GetStateID
{
get
{
return cmbState.SelectedItem.Value.ToString();
}
set
{
cmbState.SelectedItem.Value = value;
}
}
I have commented the set{} Part and used separate function to assign value to the DropdownList.
Now it is working fine.
Thanks to all for the suggestions and guidance.
Regards