Looping through ajaxcallback (WCF Service)

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Javascript

jQuery

WCFServices

I am using a for loop through "task", which is json object response. In this loop I have called a function to SAVE "task" using ajaxcallback (WCF Service). But problem is Insertion/Updation the rows are affecting randomly in tables(SQL Server).

for (var i = 0; i < tasks.length; i++) {
para = {taskName: task.Name, tasktype:TaskType }
SaveTask();
}

SaveTask()
{
$.ajax({
            type: "POST",
            url: "localhost/MyService/Task.svc/SaveTask",
            data: para,
            contentType: "application/json;charset=utf-8",
            dataType: "jsonp",
            async: false,
            success: function (data) {
                //alert("Successfully Added task");
            },
            error: function (msg) {
                alert("Failed");
            }
        });
}

I think while service is running, the next iteration starts, so it executes randomly.
If any met with the same issue please response ASAP.

Thanks