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I want to prevent this phenomenon ...

Postback when button is clicked

I want to perform the result when the button is clicked and prevent the screen refresh.

<asp:Button ID="DomainSeachButton" runat="server" Text="search" 
            OnClick="btnDomainSearch_Click" OnClientClick="onMySearch();" Width="69px" /> 
function onMySearch() {
    // __doPostBack("DomainSeachButton", "client");
    var r = confirm("Press a button!")
    if (r==true)
    {
         alert("You pressed OK!")
         return true;
    }
protected void btnDomainSearch_Click(object sender, EventArgs e)
{

    if (_cDBConnect.IsValidDBInfo() == true)
    {
        string sql = string.Format("select * from tb_licensekey_storages where cert_domain_name like '%{0}%';", txtSearchDomain.Text.Trim());

        var da = new SQLiteDataAdapter(sql, _cDBConnect.GetConnectionString());

        DataTable dt = new DataTable();

        da.Fill(dt);
        gridViewDBInfo.DataSource = dt;
        gridViewDBInfo.DataBind();
    }
}

You can easily achieve this with ASP Control UpdatePanel it will not actually refresh the whole page but the the selected content of the page, for example:

<asp:ScriptManager ID="MainScriptManager" runat="server" />
<asp:UpdatePanel ID="updtpnl" runat="server">
  <ContentTemplate>
    <asp:Button
      ID="DomainSeachButton"
      runat="server"
      Text="search"
      OnClick="btnDomainSearch_Click"
      OnClientClick="onMySearch();"
      Width="69px"
      AutoPostBack="true"
    />
    <asp:GridView ID="GridView1" runat="server"></asp:GridView>
  </ContentTemplate>
  <Triggers>
    <asp:AsyncPostBackTrigger ControlID="DomainSeachButton" EventName="Click" />
  </Triggers>
</asp:UpdatePanel>

Disable postback at click on a button, If you disable click actions doing OnClientClick=return false , it won't do All you have to do to prevent a server postback occuring is return  In order for your btnCreateSite_Click to execute the postback must take place. You do have other options to achieve your goals. From the description it sounds like you need to focus on maintaining a listbox item selection through a postback OR use ajax to accomplish whatever the button click is supposed to do.

Try changing your btnDomainSearch_Click to

$("#btnDomainSearch_Click").click( function(e){
    e.preventDefault();

    //Whatever
})

How to disable postback on an asp Button, I am creating a calculator page using c# and asp.net 2.0,i am using button controls for designing the calculator and i want to prevent postback  Examples. The following code example demonstrates how to use the PostBackUrl property to perform a cross-page post. When the user clicks the Button control, the page posts the value entered in the text box to the target page specified by the PostBackUrl property.

You can use AutoPostBack="false" in the particular button.

if AutoPostBack set false it will not send request to server otherwise it will send request to server.

<asp:Button ID="DomainSeachButton" runat="server" Text="search" AutoPostBack="false" OnClick="btnDomainSearch_Click" OnClientClick="onMySearch();" Width="69px" />

Please read this article for more information More Details

Prevent postback during button click, When a user click on that button, if I remove the "OnClientClick" there is a POSTBACK and I need to keep data. I cannot reload them because  OK – Which when clicked makes the ASP.Net Button click and thus making a PostBack to the server which normally was not happening 2. Close – Which as the name suggests is a simple jQuery Dialog Button to close the Dialog.

Disable POSTBACK on ASP:BUTTON and execute code behind , On the button click event of the button, we call a javascript function which will check if the username is entered or not. If it is not entered, it will  Click the pin icon next to the NP logo and it will keep it at the top of your browser window. If the NP icon is grayed out, it won’t do anything. Open Netflix and select what you want to watch.

How to stop postback on button click?Everything Technical, Or, you can cancel the OnClientButtonClicking event for the specific item: ASPNET. <telerik:radtoolbar 

Prevent a Specific Button from Performing Postback, While this is going on, it makes sense to disable the clicked button and click handler (“OnClick” property) and a client-side one was to use OnClientClick, like so: Not only was nothing disabled, but there was no postback.

Comments
  • Don't use asp:Button or input type=submit.
  • What does it mean? Do you mean to use only "button" or "submit"?
  • Everything is wrapped with a form (hence the name webforms). So any button, linkbutton, submit will trigger a form post (postback)
  • But how use kind of button??
  • Should UpdatePanel and AutoPostBack be used at the same time? Single use of "AutoPostBack = false" Postback happened. ex) <asp:Button ID="Button2" runat="server" Text="Button22222222" AutoPostBack="fasle" ></asp:Button> but Postback did not occur when using UpdatePanel and AutoPostBack = false.
  • Yeah when you postback set to true it refresh the content area not the whole page, otherwise nothing will change.
  • Postback occurred when using AutoPostBack = "false". When UpdatePanel and AutoPostBack = "false" were used, postback did not happen. but your comment thx