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c# Changing Textbox.Text from different class

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c# Changing Textbox.Text from different class

 
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  #1
Mar 10th, 2009
I have the function AddToText which is located in the Form1 Partial Class

C# Syntax (Toggle Plain Text) 
  1. public void AddToText(string text)
  2. {
  3. this.txtStatus.Text = this.txtStatus.Text + "\r\n";
  4. }
I want to call this from a different class so I do:
C# Syntax (Toggle Plain Text) 
  1. Form1 frm = new Form1();
  2. frm.AddToText("Test");
I click a button called start and it calls the procedure on a different class and runs the code above. But nothing appears in my textbox. It works when I call it from the Partial Class Though.

WTF?
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Re: c# Changing Textbox.Text from different class

 
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  #2
Mar 10th, 2009
The top code is actually:
C# Syntax (Toggle Plain Text) 
  1. public void AddToText(string text)
  2. {
  3. this.txtStatus.Text = this.txtStatus.Text + "\r\n" + text;
  4. }
And nothing is displayed at all in the text box
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Re: c# Changing Textbox.Text from different class

 
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  #3
Mar 10th, 2009
I just added a MessageBox.Show(txtStatus.Text); below the function
and it gives me a messagebox with whas is supposed to be in the textbox meaning that it is in there but its not displaying it.
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Re: c# Changing Textbox.Text from different class

 
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  #4
Mar 10th, 2009
I guess you have a Form1 Class which running in the first place. You created another Form class and run the the method in that class. So the method will update the will be update the textbox in the new class not the current running class. Try to put the code this way see what happen:
Form1 frm = new Form1();
frm.show();
frm.AddToText("Test");
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Re: c# Changing Textbox.Text from different class

 
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  #5
Mar 10th, 2009
Just to be sure and check all sides of the problem

I noticed:
C# Syntax (Toggle Plain Text) 
  1. this.txtStatus.Text + "\r\n" + text;

if its a one line textbox you won't be able to see the output, for testing purposes, try changing it to this
C# Syntax (Toggle Plain Text) 
  1. this.txtStatus.Text = text;

also be sure that in form shown you aren't setting the value of the textbox
Last edited by dickersonka; Mar 10th, 2009 at 12:52 pm.
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Re: c# Changing Textbox.Text from different class

 
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  #6
Mar 10th, 2009
I figured it out: in the Program.cs class i added

C# Syntax (Toggle Plain Text) 
  1. public static Form1 mainForm;
  2. [STAThread]
  3. static void Main()
  4. {
  5. Application.EnableVisualStyles();
  6. Application.SetCompatibleTextRenderingDefault(false);
  7. mainForm = new Form1();
  8. Application.Run(mainForm)
  9. }
This adds reference to form1 and now to change the text I go
Program.mainForm.AddToText("test"); and it works. Thanks for all the help!
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