pass 2D array from asp static method to javascript function

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ASP.NET

Javascript

static

Hello all, I want to initailize Return an 2D string array from ASP static WEbMethod to Javascript function
as a Return value but i can't do it

for example, in ASP Method:

[WebMethod]
public static string[,] Method(string id)
{
string[,] str; // the number of rows and columns are unknowned

for(int i=0; i < 10 ; i++)
    str[0,10] = "Test Value";// this initialization does not work

return str;
}

function myFunction() {
            $.ajax({
                type: "POST",
                url: "./page.aspx/Method",
                data: '{"id":"' + input + '"}',
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                success: function (msg) {
                        var items = [,];
                        alert(items);
                }
            });
}