how to do not postback button click - asp.net

Question

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();
}
}

Answer 1

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>

Answer 2

Try changing your btnDomainSearch_Click to
$("#btnDomainSearch_Click").click( function(e){
e.preventDefault();
//Whatever
})

Answer 3

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