How to bind the jqgrid by passing on values

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ASP.NET

C#3.5

hi all,

I am using JQgrid in webapplication, if i select the values from dropdown then I have to bind the jqgrid with that particular parameters,
below is the sample code :
I am calling the jqgrid in aspx page

<uc1:JqGrid runat="server" ID="JqGrid" Url="./CasteMaster.aspx/GetCasteDetails" TableName="UsersGrid" EditUrl="./CasteMaster.aspx/EditUpdateCasteDetails" Name="Caste Master" Pager="UsersGridPager" Visible="true" hideCasteGroupId="CasteGroupId" hideCasteId="CasteId" />
----calling the webmethod in aspx.cs page

[WebMethod]
[System.Web.Script.Services.ScriptMethod(ResponseFormat = System.Web.Script.Services.ResponseFormat.Json)]
public static CasteMasterBO GetCasteDetails()
{

try
{

CasteMasterBLL obj = new CasteMasterBLL();
return obj.getCasteData();
}
catch
{
throw;
}

}

-----calling the getcasteData method

public CasteMasterBO getCasteData()
{
DataTable dt = new DataTable();
CasteMasterBO objBO = new CasteMasterBO();
CasteMasterDAL obj = new CasteMasterDAL();
dt = obj.GetToalDt();
int pageSize = Convert.ToInt32(objBO.rows);
int limit = pageSize;
int totalPages;
int iRowCount = dt.Rows.Count;
CasteMasterBO objDeduct = new CasteMasterBO();
objDeduct.Pager = new List<castemasterbo>();
objDeduct.currpage = objBO.page;
objDeduct.totalrecords = 2000;
CasteMasterBO[] array1 = new CasteMasterBO[iRowCount];
for (int iCount = 0; iCount < iRowCount; iCount++)
{
array1[iCount] = new CasteMasterBO();
array1[iCount].CasteGroupId = dt.Rows[iCount]["CasteGroupId"].ToString();
array1[iCount].CasteGroupDesc = dt.Rows[iCount]["CasteGroupDesc"].ToString();
array1[iCount].CasteId = dt.Rows[iCount]["CasteId"].ToString();
array1[iCount].CasteDesc = dt.Rows[iCount]["CasteDesc"].ToString();



}
for (int iCount1 = 0; iCount1 < iRowCount; iCount1++)
{
objDeduct.Pager.Add(array1[iCount1]);
}
int count = array1.Length;
if (count > 0)
{
totalPages = (int)Math.Ceiling((double)2000 / limit);
}
else
{
totalPages = 0;
}
objDeduct.totalpages = totalPages;
return objDeduct;
}

from the above i am binding the jqgrid with all the values from database but my requirement is to bind the data with selected values from dropdown