The RadDatePicker control allows the user to get the value selected by the user in two ways:
Getting the Value as DateTime
In order to get the selected date as a DateTime you have to use the Value property of the RadDatePicker control.
DateTime? value = this.radDatePicker.Value;
Getting the Value as String
In order to get the selected value as a String you have to use the ValueString property of the RadDatePicker
string valueString = this.radDatePicker.ValueString;
The ValueString property returns a string representation of the currently selected value formatted
according to the pattern set to the DisplayValueFormat property.