Input Type text box Special Character and copy,Paste and Drage text not allow validation

  <script type="text/javascript">

    function blockSpecialChar(e) {

        var k;

        document.all ? k = e.keyCode : k = e.which;

        return ((k > 64 && k < 91) || (k > 96 && k < 123) || k == 8 || k == 32 || (k >= 48 && k <= 57));

    }

</script>

 <input id="name" type="text" name="name" placeholder="Enter name"  

 onpaste="return false;" onCopy="return false" onCut="return false" onDrag="return false" onDrop="return false" onkeypress="return blockSpecialChar(event)"

 class="form-control" value="@Model.EMPLOYEE_INFO_PERSONAL_DETAILS.FIRST_NAME" required />