Question

Today I account a question, In c# winform program.

if there are Form A and Form B; Form B has a textbox (need to read only)

The Form A code like this:

B b = new B("FormB");
b.Show();

The FormB code like this:

Situation1:

public B(string str)
{
   this.textbox1.text = str;

   this.textbox1.Enable = false;
}

I deploy the program to customer server, but the textbox1.text = "", have no value, but it works in my local computer.

I try this:

Situation2:

public B(string str)
{
    this.textbox1.text = str;

    this.textbox1.ReadOnly = true;        
}

Then texbox1.text = "FormB"; it works in my local computer and customer server.

The key and important question is ,why the situation1 can works my local computer not works in customer server?

Can anybody tell this is why?

Answer 1

Let me see if I understand you correctly, you are asking why the text on the TextBox is updated when you use ReadOnly = true and not Enabled = false?

---

If so, I guess it’s by design.

From MSDN: TextBoxBase.ReadOnly Property

When this property is set to true, the contents of the control cannot
be changed by the user at runtime. With this property set to true, you
can still set the value of the Text property in code. You can use this
feature instead of disabling the control with the Enabled property to
allow the contents to be copied and ToolTips to be shown.