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How to open page in new tab using the response. redirect at asp.net

I want to open a new tab or a new page by using Response.Redirect in a button click handler. I'm using a query string to pass some values. How can I open he page in a new tab?
protected void btnSave_Click(object sender, EventArgs e)
{
...//some code to insert records
Response.Redirect("NewQuote.aspx?val=" + this.txtQuotationNo.Text);//displaying gridview in other page to print what needed
}

Try this. This works sure for me...
protected void btnSave_Click(object sender, EventArgs e)
{
...//some code to insert records
Response.Write("<script>window.open ('NewQuote.aspx?val=" + txtQuotationNo.Text+"','_blank');</script>");
}

Simple solution is here.
Edit your html button element and add attribute OnClientClick="target ='_blank';".
<asp:Button ID="myButton" runat="server" CssClass="btn1"
OnClick="btnSave_Click" OnClientClick="target ='_blank';" />
Then in btnSave_Click
protected void btnSave_Click(object sender, EventArgs e) {
Response.Redirect(url);
}

You can change your design element as below : OnClientClick
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" OnClientClick ="document.forms[0].target = '_blank';" />
Javascript code :
Response.Write("<script>");
Response.Write("window.open('NewQuote.aspx' ,'_blank')");
Response.Write("</script>");

I encountered this same problem today.
Response.write didn't work for me, to solve it I used instead System.Web.UI.ScriptManager.RegisterClientScriptBlock.
This is how your btnSave click event should be:
protected void btnSave_Click(object sender, EventArgs e)
{
...//some code to insert records
System.Web.UI.ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "openModal", "window.open('NewQuote.aspx?val= "+ this.txtQuotationNo.Text+"' ,'_blank');", true);
}
NOTE: I'm using ScriptManager.RegisterClientScriptBlock because the button is inside an UpdatePanel, if that's not your case you should try:
protected void btnSave_Click(object sender, EventArgs e)
{
...//some code to insert records
Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "openModal", "window.open('NewQuote.aspx?val= " + this.txtQuotationNo.Text + "' ,'_blank');", true);
}

if you are using http
then use below code
Response.Write("<script>window.open ('URL','_blank');</script>");
this code cannot be used for https
for https do below
javascript in page
function shwwindow(myurl) {
window.open(myurl, '_blank');
}
in c# code behind
string URL = ResolveClientUrl("~") + "**internal page path**";
ScriptManager.RegisterStartupScript(this, this.GetType(), "show window",
"shwwindow('"+URL+"');", true);
this code cannot bybass the browser popup blocker. user must allow it to run.
for ie it opens in new window or new tab up to ie version
in firefox and chrome it opens new tab
enjoy it!!

A redirect is always in the same page as where you came from, you can't open a new window from a redirect call.
I would suggest to inject some javascript code in the client to open the new page on reload, or change to a control that can open to a new page, like a LinkButton with the right Target attribute.

You can use ScriptManager to do the needed:
private void Redirect_New_Tab(string url_To_Open)
{
string modified_URL = "window.open('" + url_To_Open + "', '_blank');";
ScriptManager.RegisterStartupScript(this, typeof(string), "OPEN_WINDOW", modified_URL , true);
}

Worked for me when I left the Double Quotes off of target ='_blank';

Response.write didn't work for me, so I used instead System.Web.UI.ScriptManager.RegisterClientScriptBlock.
System.Web.UI.ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "openModal", "window.open('NewQuote.aspx?val= "+ this.txtQuotationNo.Text+"' ,'_blank');", true);

I spent quite some time on this, and while it does work to set the target on the form to _blank it will mean that every other control on that page will attempt to open in a new window afterwards. And you can't manipulate the form back server side, since the response will never reach the orginal tab.
So I made it work with a combination of setting the target to _blank when the button is clicked, and then shortly after reset the target back.
I put in this Javascript function on the page:
<script type="text/javascript">
function openInNewTab() {
document.forms[0].target = "_blank";
setTimeout(function () {
document.forms[0].removeAttribute('target'); // After 500 ms revert back to normal mode so all other controls are not affected.
}, 500);
}
And on the control that needs to open in a new tab just add:
OnClientClick="openInNewTab();"

ASP.NET - Use codebehind for a menu click event C#

I have a logout menu using css in my project. Usually css menu only accepts link via
Now, what I want is the Logout menu will call function from codebehind.
My code for logout button:
<li><div class="some css class here"><a>Logout</a></div></li>
and the function I want to call:
protected void btnLogout_Click(object sender, EventArgs e)
{
FormsAuthentication.SignOut();
Session.Clear();
Session.Abandon();
Response.Redirect("~/login.aspx");
}
Any possible solutions for calling btnLogout_Click on my Logout menu? Thanks in advance..

Try this...
<li><div class="some css class here"><a id="atag" onserverclick="atag_ServerClick" runat="server">Logout</a></div></li>
In codebehind you have to call the anchor tag's function:
private void atag_ServerClick(object sender, System.EventArgs e)
{
atag.Target="url";
}
OR
As per your Requirement:
private void atag_ServerClick(object sender, System.EventArgs e)
{
FormsAuthentication.SignOut();
Session.Clear();
Session.Abandon();
Response.Redirect("~/login.aspx");
}
Hope this helps...

Instead of using anchor use LinkButton
<asp:LinkButton id="LinkButton1"
Text="Logout"
OnClick="atag_ServerClick"
runat="server"/>
and get your code work :)
In short just replace <a>Logout</a> with my code.

How do update and redirect to previous page using javascript

I have a news page in witch comments can be added. If i click a comment i go to a comment page where i can choose to delete the comment. If i delete the comment i want to go back to the news page and refresh the page so that the comments disapears.
I tryed adding this but then the remove function was not reached
<asp:Button runat="server" ID="btnRemoveComment" Text="Ta bort" OnClientClick="JavaScript: window.history.back(1); return false;" />
Commentpage.aspx
<asp:Button runat="server" ID="btnRemoveComment" />
Commentpage.aspx.cs
protected override void OnLoad(EventArgs e)
{
btnRemoveComment.Click += btnRemoveComment_Click;
}
private void btnRemoveComment_Click(object sender, EventArgs e)
{
CommentFactory.RemoveComment(CurrentPage);
}

a button can't apply two events, it's javascript or code-behind. Try to redirect in code-behind and use Ajax for dynamic update.

I don't think it is ok going back and forth between the news page and comments page. Try this
private void btnRemoveComment_Click(object sender, EventArgs e)
{
CommentFactory.RemoveComment(CurrentPage);
Response.Redirect("news.aspx");
}

onclick second click

New to asp.net, I am having a problem on a website I am creating, I am using a master page to build my pages. I am trying to change the css class of a li tag using the onclick event in linkbuttons:
<asp:LinkButton runat="server" id="AboutButton" OnClick="about_click" PostBackUrl="about.aspx"><span>About</span></asp:LinkButton>
This linkbutton calls a function in the master page's code behind:
protected void about_click(object sender, EventArgs e)
{
if(Page.IsPostBack)
{
about.Attributes.Add`enter code here`("class", "current");
}
}
This only works when the page is loaded and the button is clicked again. Any help would be greatly appreciated.

By adding: if(Page.IsPostBack) you're specifically telling it not to execute that code the first time the page is loaded, but you want it to happen when the page is first loaded, by the sounds of the question.

Why did you add if(Page.IsPostBack). Try this
protected void Page_Load(object sender, EventArgs e)
{
if(!Page.IsPostBack)
{
about.Attributes.Add("class", "current"); //initial setting here
}
}
protected void about_click(object sender, EventArgs e)
{
about.Attributes.Add("class", "current");
}

Button.OnClientClick question

I'm gonna post some more code to show exactly what I'm trying to do,
I'm adding the button using programming code and not markup but the OnClick won't work (giving the following error:
System.Web.UI.WebControls.Button.OnClick(System.EventArgs)' is inaccessible due to its protection level.
Button btnopslaan = new Button();
btnopslaan.Text = "Opslaan";
btnopslaan.ID = "btnOpslaan";
btnopslaan.CssClass = ".opslaan";
btnopslaan.Click += new EventHandler(btnopslaanClick);
btnopslaan_arr[btn_count] = btnopslaan;
add_button(btnopslaan);
protected void btnopslaanClick(object sender, EventArgs e)
{
Debug.WriteLine("success");
}
I just can't find out why this isn't working.
Anyone who can help me out?

You need to use OnClick for server side clicks rather than OnClientClick
Either you can use it inline >
<asp:Button id="btnopslaan" runat="server' OnClick="btnopslaanClick" />
Or in Code behind >
btnopslaan.Click+=new EventHandler(btnopslaanClick);

or you make it a postback call to the server. in your
aspx write:
<asp:Button runat="server" ID="buttonOpslaan" Text="opslaan" ></asp:Button>
codebehind write this:
protected void Page_Init(object sender, EventArgs e)
{
buttonOpslaan.Click += new EventHandler(buttonOpslaan_Click);
}
// mind: this method can be private
void buttonOpslaan_Click(object sender, EventArgs e)
{
//do something
}
or handle it with the AutoEventWireUp (recommended) like:
<asp:Button runat="server"
ID="buttonOpslaan"
OnClick="buttonOpslaan_Click"
Text="opslaan" ></asp:Button>
// mind: this method cannot be private, but has to be protected at least.
protected void buttonOpslaan_Click(object sender, EventArgs e)
{
//do something
}
or do it completely from code behind:
// note: buttonOpslaan must have an (autoassigned) ID.
protected void Page_Init(object sender, EventArgs e)
{
Button buttonOpslaan = new Button();
buttonOpslaan.Text = "opslaan!";
buttonOpslaan.Click += new EventHandler(buttonOpslaan_Click);
form1.Controls.Add(buttonOpslaan);
}
protected void buttonOpslaan_Click(object sender, EventArgs e)
{
//do something
}
or handle it clientside with javascript in your ASPX (it will not reach the server)
<script type="text/javascript">
function buttonOpslaan_Click(){
alert("test");
return false;
}
</script>
<asp:Button runat="server"
ID="buttonOpslaan"
OnClientClick="buttonOpslaan_Click()"
Text="opslaan" ></asp:Button>
Update: (by comments)
if you add the control via an eventhandler (like the onchange event of a dropdownlist), the control is 'lost' on next postback, or even as soon as the Page is send to the client (due to the stateless (there is no mechanism to maintain the state of application) behaviour and lifecycle of .Net).
So simply adding a control once is never going to work.
That means you have to rebuild the control every time a postback occurs. My preferred way to do this is store a list/document somewhere that descrbes what controls must be created each time. Possible locations are, from worse to good (IMHO):
Session
Viewstate
Cache
XML/IO
Database
After all, you are posting "data" to the server (that represents a control) and you want to save that for further use.
If the controls to be created aren't that complex you could implement a Factory Pattern like a WebControlFactory that stores only a few properties in a List or Dictionary, which is read every time to recreate the controls again (and again, and again, and again)

btnopslaanClick should be client side, in the .aspx itself have:
<script type="text/javascript">
function btnopslaanClick() {
alert("success");
}
</script>

btnopslaan.Click+=new EventHandler(btnopslaanClick);
protected void btnopslaanClick(object sender, EventArgs e)
{
Debug.WriteLine("succes");
}