problem reload jqgrid data

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ASP.NET

jQuery

JQGrid

I use two jqgrid. I want when click on row in grid1 then grid2 show data by Ajax on base parameters of grid1. How to change data of grid2 by Ajax? this code for grid2

$("#gridrelatedLette").jqGrid(
{
    url: "GetLetterInformationHandler.ashx?CurrentUser=" + 1157 + "&IndCode=" + rowData["PctIndCode"] + "&IndSerial=" + rowData["PctIndNum"] + "&TabName=relatedLetters",
    datatype: 'json',
    width: $("#relatedLetterTab").width()-20,
    height: a1,
    direction: "rtl",
    colNames: ['1', '2', '2', '3', '4', '5','6',],
    colModel: [
        { name: 'IRltType', width: 40, sortable: false, hidden: false, template: CenterTemplate },
        { name: 'IRltLettDate', width: 60, sortable: false, hidden: false, template: CenterTemplate },
        { name: 'IRltLettNum', width: 60, sortable: false, hidden: false, template: CenterTemplate },
        { name: 'IRltLettType', width:30, sortable: false, hidden: false, template: CenterTemplate },
        { name: 'IndTopic', width: 100, sortable: false, hidden: false, template: CenterTemplate },

    ],
    rowNum: 20,
    loadonce: true,
    rowList: [5, 10, 20],
    recordpos: "left",
    ignoreCase: true,
    toppager: true,
    viewrecords: true,
    sortorder: "desc",
    scrollOffset: 1,
    editurl: 'clientArray',
    shrinkToFit: true ,
    jsonReader:
    {
        repeatitems: false,
    },
    rowattr : function(rd) {
        return { "class": "myRowClass" };
    },
    gridview: true,
});

This code is a function that when click on one of the row of grid1 is called and rowData means the information of row(this function call in selectedrow of grid1 and parameter change by click on row."relatedLetters" is name of tab that jqgri2 inside this tab