How to pass parameter to SSRS report in asp.net

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C#

ASP.NET

SSRS

Parameter

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Hi,
i,m new in SSRS and for practice i,m passing parameter to report which accepts parameter but got exception
"An exception of type 'Microsoft.Reporting.WebForms.ReportServerException' occurred in Microsoft.ReportViewer.WebForms.dll but was not handled in user code

Additional information: The value provided for the report parameter 'ProductCategoryID' is not valid for its type. (rsReportParameterTypeMismatch)"

my code is:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Microsoft.Reporting.WebForms;

namespace Practice
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            ShowReport();
        }
        public void ShowReport()
        {
            ReportViewer1.ServerReport.ReportServerUrl = new  Uri("http://xxxxxxxxx/ReportServer");
            ReportViewer1.ServerReport.ReportPath = "/Practice Reports/Parameter_Example";
            ReportViewer1.ShowParameterPrompts = false;

            ReportParameter[] param = new ReportParameter[1];
            param[0] = new ReportParameter("ProductCategoryID", "Gloves");
            ReportViewer1.ServerReport.SetParameters(param);
            ReportViewer1.ServerReport.Refresh();
            
        }
    }
}

here "ProductCategoryID" is name of attribute and "Gloves" is its value.
can please any one help me :(
thanx.