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Mar 10th, 2009

c# Changing Textbox.Text from different class

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I have the function AddToText which is located in the Form1 Partial Class

C# Syntax (Toggle Plain Text)
public void AddToText(string text)
{
this.txtStatus.Text = this.txtStatus.Text + "\r\n";
}
public void AddToText(string text)
{
this.txtStatus.Text = this.txtStatus.Text + "\r\n";
}

I want to call this from a different class so I do:

C# Syntax (Toggle Plain Text)
Form1 frm = new Form1();
frm.AddToText("Test");
Form1 frm = new Form1();
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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mastermosley

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Mar 10th, 2009

Re: c# Changing Textbox.Text from different class

The top code is actually:

C# Syntax (Toggle Plain Text)
public void AddToText(string text)
{
this.txtStatus.Text = this.txtStatus.Text + "\r\n" + text;
}
public void AddToText(string text)
{
this.txtStatus.Text = this.txtStatus.Text + "\r\n" + text;
}

And nothing is displayed at all in the text box

mastermosley

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Mar 10th, 2009

Re: c# Changing Textbox.Text from different class

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.

mastermosley

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Mar 10th, 2009

Re: c# Changing Textbox.Text from different class

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");

hieuuk

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Mar 10th, 2009

Re: c# Changing Textbox.Text from different class

Just to be sure and check all sides of the problem

I noticed:

C# Syntax (Toggle Plain Text)
this.txtStatus.Text + "\r\n" + text;
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)
this.txtStatus.Text = text;
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.

dickersonka

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Mar 10th, 2009

Re: c# Changing Textbox.Text from different class

I figured it out: in the Program.cs class i added

C# Syntax (Toggle Plain Text)
public static Form1 mainForm;
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
mainForm = new Form1();
Application.Run(mainForm)
}
public static Form1 mainForm;
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
mainForm = new Form1();
Application.Run(mainForm)
}

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!

mastermosley

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