In many cases we need to use read only text box so user cannot edit the value but readonly textbox will lost its value after postback. Let’s say you have a read only text box to set date by using ajax calendar so after post back date will be lost, other case might be you are setting some value in design view of aspx page which will lost after post back.
Suppose you have following HTML in your page
<asp:TextBox ID="text1" runat="server" Value="ABC" /> <asp:TextBox ID="text2" runat="server" Value="XYZ" ReadOnly="true"/>
After post back text2 will lost it's value, text2 values is posted back but will not populate a read-only textbox after postback, so how to keep text2 value even after postback, we can manually populate read only text box value by adding following line to Page_Load method
text2.Text = Request.Form[text2.UniqueID];
another easier way is to never use read only property at design time but add attribute from Page_Load method like this
Another problem with ReadOnly = true property setting at design time is that when you will try to set text box value from ajax calendar it will not set anything but by using
text2.Attributes.Add(“readonly”, “readonly”) you can easily set calendar selected date in text box.
Having 13+ years of experience in Microsoft Technologies (C#, ASP.Net, MVC and SQL Server). Worked with Metaoption LLC, for more than 9 years and still with the same company. Always ready to learn new technologies and tricks.
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