C# – Pass Query String to User Control from Parent Page

asp.netcuser-controls

i have create a user control search.ascx with query string values and i m accessing this page from Parent page(Rcomm.aspx) and now this Page is open from another page(view.apsx) on button click using hyperlink navigateurl. my question is that how can i pass my user control query string from view.aspx

Best Answer

A user control has access to the page's URL the same as any normal ASP.NET page does; thus, in order to retrieve the QueryString from the user control, the normal syntax will work:

Request.QueryString('key')

However, I consider this poor style, because I think of user controls as a modular item you can embed in ANY page: thus tying it directly to a particular querystring value seems to go against that. However you may have valid reasons for this.

I'm not sure I understand the second part of your question:

how i make hyperlink navigate URL with query string for open my Rcomm.aspx

Could you please clarify?

ADDITIONAL: OK it seems to me like you have a link in your user control, and want to use a querystring value from the user control's parent page (Rcomm.aspx) to use in the link to a third page. Correct me if I am wrong.

In this case, you would read the querystring from the user control, then append to another URL using NavigateURL:

URL: Rcomm.aspx?field=value

(in code behind:)

Dim qs as string

qs = Request.QueryString('field')

MyHyperlink.NavigateURL = "newpage.aspx?field2=" & qs

Or something similar. Yes?

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C# – Cross-thread operation not valid: Control accessed from a thread other than the thread it was created on

As per Prerak K's update comment (since deleted):

I guess I have not presented the question properly.

Situation is this: I want to load data into a global variable based on the value of a control. I don't want to change the value of a control from the child thread. I'm not going to do it ever from a child thread.

So only accessing the value so that corresponding data can be fetched from the database.

The solution you want then should look like:

UserContrl1_LOadDataMethod()
{
    string name = "";
    if(textbox1.InvokeRequired)
    {
        textbox1.Invoke(new MethodInvoker(delegate { name = textbox1.text; }));
    }
    if(name == "MyName")
    {
        // do whatever
    }
}

Do your serious processing in the separate thread before you attempt to switch back to the control's thread. For example:

UserContrl1_LOadDataMethod()
{
    if(textbox1.text=="MyName") //<<======Now it wont give exception**
    {
        //Load data correspondin to "MyName"
        //Populate a globale variable List<string> which will be
        //bound to grid at some later stage
        if(InvokeRequired)
        {
            // after we've done all the processing, 
            this.Invoke(new MethodInvoker(delegate {
                // load the control with the appropriate data
            }));
            return;
        }
    }
}

Jquery – How to format a Microsoft JSON date

eval() is not necessary. This will work fine:

var date = new Date(parseInt(jsonDate.substr(6)));

The substr() function takes out the /Date( part, and the parseInt() function gets the integer and ignores the )/ at the end. The resulting number is passed into the Date constructor.

I have intentionally left out the radix (the 2nd argument to parseInt); see my comment below.

Also, I completely agree with Rory's comment: ISO-8601 dates are preferred over this old format - so this format generally shouldn't be used for new development.

For ISO-8601 formatted JSON dates, just pass the string into the Date constructor:

var date = new Date(jsonDate); //no ugly parsing needed; full timezone support

Best Answer

Related Solutions

C# – Cross-thread operation not valid: Control accessed from a thread other than the thread it was created on

Jquery – How to format a Microsoft JSON date

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