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Show Dialog with fullscreen

You can show the dialog in fullscreen by passing true as argument to the dialog show method.

tagHelper
controller.cs
<div id='container' >
    <ejs-button id="targetButton" content="Open Dialog"></ejs-button>
    <ejs-dialog id="dialog" header="Dialog" content="This is a Dialog with fullscreen display." target="#container" width="250px">
        <e-dialog-buttons>
            <e-dialog-dialogbutton buttonModel="@ViewBag.DialogButtons1" click="dlgButtonClick"></e-dialog-dialogbutton>
            <e-dialog-dialogbutton buttonModel="@ViewBag.DialogButtons2" click="dlgButtonClick"></e-dialog-dialogbutton>
        </e-dialog-buttons>
    </ejs-dialog>
</div>

<script>
    document.getElementById('targetButton').onclick = function () {
        var dialog = document.getElementById("dialog").ej2_instances[0];
        dialog.show(true);
    }
    function dlgButtonClick() {
        var dialogObj = document.getElementById('dialog').ej2_instances[0];
        dialogObj.hide();
    }
</script>

<style>

    #container {
        height: 100%;
        width: 100%;
        position: absolute;
        padding: 20px;
        margin: 0px;
        left: 0px;
        right: 0px;
        bottom: 0px;
        top: 0px;
    }
</style>
public class HomeController : Controller
{

    public class ButtonModel
    {
        public string content { get; set; }
        public bool isPrimary { get; set; }
        public string cssClass { get; set; }
    }
    public ActionResult Index()
    {
        ViewBag.DialogButtons1 = new ButtonModel() { isPrimary = true, cssClass = "e-flat", content = "OK" };
        ViewBag.DialogButtons2 = new ButtonModel() { content = "Cancel", cssClass = "e-flat" };
        return View();
    }

}