Instantiating a web service, c#, .net

protected void ButtonContinuePayment_Click(object sender, EventArgs e)
        {      
            testwebservice.Request_Return_Parms rrRequest = new testwebservice.Request_Return_Parms();
            testwebservice.CCAuthRequest myCCAuthRequest;           

            string MerchantID = "MYMERCHID";
            decimal AuthorizationAmount = Convert.ToDecimal(litFee.Text);
            string OneStepTranType = "TRANTYP1";
            string ApplicationIDPrimary = litRegID2.Text;
            string ReturnURL = "https://mysite.com/Confirm.aspx";
            int AuthorizationAttemptLimit = 2;
            string ApplicationIDSecondary = "SecondID";  
            string ApplicationStateData = "StateData";
            string StyleSheetKey = "11f15af0a02999";
            string EmailAddressDeptContact = "jane.doe@mysite.com";

            try
            {                
                if (rrRequest.RequestReturnCode == 0)
                {   
//this is where I'm getting the error. Use of unassigned local variable 'myCCAuthRequest'	
                   rrRequest = myCCAuthRequest.AuthCapRequest(MerchantID, AuthorizationAmount, OneStepTranType, ApplicationIDPrimary, ReturnURL, AuthorizationAttemptLimit, ApplicationIDSecondary, ApplicationStateData, StyleSheetKey, EmailAddressDeptContact);
                }
            }
            catch
            {
                Response.Write("Error Processing payment");
            }
        }