how can ia call this method from browser to know the output of the service

[ServiceContract]
public interface IService
{
    [OperationContract(Name = "EmployeeDetailsByEmpNoJson")]
    [WebInvoke(Method = "POST",
        ResponseFormat = WebMessageFormat.Json,
     UriTemplate = "EmployeeDetailsByEmpNoJson")]
    string EmployeeDetailsByEmpNoJson(string Schema, string Connection_Type, string Empno);

}

public class Service : IService
{
[WebMethod]
[ScriptMethod(ResponseFormat = ResponseFormat.Json)]

  public string EmployeeDetailsByEmpNoJson(string schema, string connect_Test_or_Production, string Empno)
  {

      try
      {


          if (fnOpenConnection(schema, connect_Test_or_Production) == true)
          {
              _objDataSet = new DataSet();
              _objOleDBCommand = new OleDbCommand();
              _objOleDBDataAdapter = new OleDbDataAdapter();

              _objOleDBCommand.Connection = _objOleDBConnection;
              _objOleDBCommand.CommandType = CommandType.Text;
              string strQuery = "select empname,desig,department,branch,to_char(doj,'dd-Mon-yyyy')doj,impact_lvl,comp_email,mob_co, project  from   vw_emp_dtls where  dol is null and empno=" + Empno + "";

              _objOleDBCommand.CommandText = strQuery;

              _objOleDBDataAdapter.SelectCommand = _objOleDBCommand;
              _objOleDBDataAdapter.Fill(_objDataSet);

              if (_objDataSet.Tables.Count > 0)
              {

                  System.Web.Script.Serialization.JavaScriptSerializer serializer = new System.Web.Script.Serialization.JavaScriptSerializer();
                  List<Dictionary<string, object>> rows = new List<Dictionary<string, object>>();
                  Dictionary<string, object> row;
                  foreach (DataRow dr in _objDataSet.Tables[0].Rows)
                  {
                      row = new Dictionary<string, object>();
                      foreach (DataColumn col in _objDataSet.Tables[0].Columns)
                      {
                          row.Add(col.ColumnName, dr[col]);
                      }
                      rows.Add(row);
                  }
                  return serializer.Serialize(rows);

             
              }
              else
              {
                  
                  return null;
              }
          }
          else
          {
             
              return null;
          }
      }
      catch (OleDbException dbEx)
      {
          return null;
      }
      catch (Exception ex)
      {
          return null;
      }
      finally
      {
          _objDataSet = null;
          _objOleDBCommand = null;
          _objOleDBDataAdapter = null;
          fnCloseConnection();
      }
  }