Read Only / Non-Editable TextBox

To make Text box Read only (or Non-Editable) without disable it and appear on gray style by adding the following attributes to TextBox tag

<asp:TextBox ID="txtBox1" runat="server" onkeypress="return false;" onpaste="return false;" Text="Read Only TextBox" />

OR

<asp:TextBox ID="txtBox2" runat="server" ReadOnly="true" Text="Read Only TextBox" />

Also you can use below attributes but it works only with IE 

contenteditable="false" Or unselectable="on"