SSIS WebService Task and Input Variables

Hello! to day im have are some problem with my SSIS project.

in wsdl file for request report need set some parameters as InputParams for example part source code :

 <s:complexType name="InputParams">
                <s:sequence id="InputSequence">
                <s:element maxOccurs="1" minOccurs="0" name="INCLUDE_DELETED" type="s:string"/>
				<s:element maxOccurs="1" minOccurs="0" name="MODIFIED_FROM" type="s:string"/>
				<s:element maxOccurs="1" minOccurs="0" name="MODIFIED_TO" type="s:string"/>
				<s:element maxOccurs="1" minOccurs="0" name="SHIFT_DATE" type="s:string"/>
				<s:element maxOccurs="1" minOccurs="0" name="SHIFT_NUMBER" type="s:long"/>
				</s:sequence>
            </s:complexType>

for set this parameters im want use some User Variables!

but if im do that :

 InputParams pars = new InputParams();
 pars.INCLUDE_DELETED = "1";
 pars.MODIFIED_FROM = "2015-08-09T12:13:14";
 pars.MODIFIED_TO = "2015-08-13T12:13:14";
 pars.SHIFT_DATE = "";

  Dts.Variables["User::Inputs"].Value = pars;

im get are error about not allowed type!

please ask me how send my parameters without hand change ???