Setting Parameter Values SSRS Sql2008R2

I am using the stored procedure in the SQL Report(SSRS Sql2008R2).The stored procedure has following parameters.
(@StartDate As DateTIME ,
 @EndDate As DateTIME,
 @DateFilter As Varchar(MAX),
 @AccountNumber AS VARCHAR(10),
 @BranchID VARCHAR(500)  = 0,
 @Region    VARCHAR(200)  = 0,                                  @OrderBy VARCHAR(100) = 'POSTDATE DESC',
 @LogProgress INT = 1,
 @LogError INT = 2)

The procedure returns data in sql server management studio using parameters @StartDate 1/1/2011,@EndDate 10/5/2011,@DateFilter POSTDATE BETWEEN '01/01/2011' AND '10/05/2011'
 @AccountNumber 0000123456, @BranchID ('-1'), @Region 0, @OrderBy POSTDATE

In Sql Report I set the parameters DataTypes as Date/Time,Text,integer.
I am entering the same values(the values used in Sql server management studio) for StartDate,EndDate,DateFilter,AccountNumber,BranchID,Region and Order_By parameters while report is running.

It is not returing any rows.Empty report is showing up.I am assuming something wrong in giving parameter values for the following parameters.
DateFilter: POSTDATE BETWEEN '01/01/2011' AND '10/05/2011'
BranchID: -1
Region: 0
Order By: POSTDATE
I entered the above values in Text Boxes.
Is there any other way to set the above parameters so that it returns the data.

Thanks