jquery访问asp.net 返回的json对象

/// <summary>
/// dataTable转换成Json格式
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static string DataTable2Json(DataTable dt, string table)
{
StringBuilder jsonBuilder = new StringBuilder();
jsonBuilder.Append("{\"");
jsonBuilder.Append(table);
jsonBuilder.Append("\":[");
for (int i = 0; i < dt.Rows.Count; i++)
{
jsonBuilder.Append("{");
for (int j = 0; j < dt.Columns.Count; j++)
{
jsonBuilder.Append("\"");
jsonBuilder.Append(dt.Columns[j].ColumnName);
jsonBuilder.Append("\":\"");
jsonBuilder.Append(dt.Rows[i][j].ToString());
jsonBuilder.Append("\",");
}
jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
jsonBuilder.Append("},");
}
jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
jsonBuilder.Append("]");
jsonBuilder.Append("}");
return jsonBuilder.ToString();
}

$.ajaxWebService("AddUser.aspx/GetOrg", "{'group':'" + group + "'}",
function(data) {
$("#dlOrg").empty();
$("#dlOrg").append("<option value='1'>" + "hello" + "</option>");

var json = eval("(" + data.d + ")"); //转换为json对象
})

$.ajaxWebService = function(url, dataMap, fnSuccess) {
$.ajax({
type: "POST",
contentType: "application/json",
url: url,
data: dataMap,
dataType: "json",
success: fnSuccess
});
}