How to call the existing form in ASP.Net C# windows form?

[Jason Huang]

Hi,

Thanks for help in advance!
In Form1, I "New" a Form2 and ShowDialog the Form2, it's OK.
My intention is passing a value from Form2 to Form1.
However, in Form2, I shouldn't "New" a Form1, 'cuz it will open a new Form1,
the new Form1 will get the value. And the original Form1 get nothing!
What do I need to do to let the ORIGINAL Form1 get the target value?
Any help will be highly appreciated.

Jason

[Annie]

hello,
You can create a public static property and set it to any value and you can
access it in form1.
eg
public static string myvalue
{
set {value = "what ever"};
get {return value;}
}

"Jason Huang" <Ja************ @hotmail.com> wrote in message
news:%2******** *******@TK2MSFT NGP15.phx.gbl.. .

Hi,

Thanks for help in advance!
In Form1, I "New" a Form2 and ShowDialog the Form2, it's OK.
My intention is passing a value from Form2 to Form1.
However, in Form2, I shouldn't "New" a Form1, 'cuz it will open a new
Form1, the new Form1 will get the value. And the original Form1 get
nothing!
What do I need to do to let the ORIGINAL Form1 get the target value?
Any help will be highly appreciated.

Jason

[Ignacio Machin \( .NET/ C# MVP \)]

Hi,

You have several ways to do so, like:

1- Pass a reference from form1 to form2, then when needed you can update
form1 , note that form1 should have a public member to receive the value
back
// in form 1
form2 = new Form2( this);
form2.ShowDialo g();

//in form 2:
//constructor
public Form2( Form1 parent) { this.parentForm = parent;}

// in a method
parentForm.Publ icProperty = "what ever value";
2- make tha value accesible to form1 as a public property:
// in form 1
form2 = new Form2( this);
form2.ShowDialo g();
form1.receivedv alue = form2.PublicPro perty;

3- Make a static public property in form1 , this is the last resort,

//form1
public static string A_Property { get.. set }

//form2
//inside a method:
//note I use the Form1 type, not any instnace
Form1.A_Propert y = "a value" ;
cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation
"Jason Huang" <Ja************ @hotmail.com> wrote in message
news:%2******** *******@TK2MSFT NGP15.phx.gbl.. .

Hi,

Thanks for help in advance!
In Form1, I "New" a Form2 and ShowDialog the Form2, it's OK.
My intention is passing a value from Form2 to Form1.
However, in Form2, I shouldn't "New" a Form1, 'cuz it will open a new
Form1, the new Form1 will get the value. And the original Form1 get
nothing!
What do I need to do to let the ORIGINAL Form1 get the target value?
Any help will be highly appreciated.

Jason

[Jason Huang]

Thank you for help me!
But I got another question for this.
Saying that Form3 and Form4 will be also using the Form2, then how do we
build up the Form2 constructor,
so that Form3 and Form4 can get the value passed from Form2? Given that
Form1, Form2, Form3 and Form4
have no mdi relationship.
Thanks in advance again.
Jason
"Ignacio Machin ( .NET/ C# MVP )" <ignacio.mach in AT dot.state.fl.us > ¼¶¼g©ó¶l¥ó·s»D: %2************* **@tk2msftngp13 .phx.gbl...

Hi,

You have several ways to do so, like:

1- Pass a reference from form1 to form2, then when needed you can update
form1 , note that form1 should have a public member to receive the value
back
// in form 1
form2 = new Form2( this);
form2.ShowDialo g();

//in form 2:
//constructor
public Form2( Form1 parent) { this.parentForm = parent;}

// in a method
parentForm.Publ icProperty = "what ever value";
2- make tha value accesible to form1 as a public property:
// in form 1
form2 = new Form2( this);
form2.ShowDialo g();
form1.receivedv alue = form2.PublicPro perty;

3- Make a static public property in form1 , this is the last resort,

//form1
public static string A_Property { get.. set }

//form2
//inside a method:
//note I use the Form1 type, not any instnace
Form1.A_Propert y = "a value" ;
cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation
"Jason Huang" <Ja************ @hotmail.com> wrote in message
news:%2******** *******@TK2MSFT NGP15.phx.gbl.. .

Hi,

Thanks for help in advance!
In Form1, I "New" a Form2 and ShowDialog the Form2, it's OK.
My intention is passing a value from Form2 to Form1.
However, in Form2, I shouldn't "New" a Form1, 'cuz it will open a new
Form1, the new Form1 will get the value. And the original Form1 get
nothing!
What do I need to do to let the ORIGINAL Form1 get the target value?
Any help will be highly appreciated.

Jason

[Ignacio Machin \( .NET/ C# MVP \)]

Hi Jason,
You kind of lost me, too many forms for so early in the morning :)

If your app is not MDI, and you know you will only have one instance of each
form created at the most, you can use a static property in each individual
form to hold a reference.
cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"Jason Huang" <Ja************ @hotmail.com> wrote in message
news:eK******** *****@tk2msftng p13.phx.gbl...

Thank you for help me!
But I got another question for this.
Saying that Form3 and Form4 will be also using the Form2, then how do we
build up the Form2 constructor,
so that Form3 and Form4 can get the value passed from Form2? Given that
Form1, Form2, Form3 and Form4
have no mdi relationship.
Thanks in advance again.
Jason
"Ignacio Machin ( .NET/ C# MVP )" <ignacio.mach in AT dot.state.fl.us >
¼¶¼g©ó¶l¥ó·s»D: %2************* **@tk2msftngp13 .phx.gbl...

Hi,

You have several ways to do so, like:

1- Pass a reference from form1 to form2, then when needed you can update
form1 , note that form1 should have a public member to receive the value
back
// in form 1
form2 = new Form2( this);
form2.ShowDialo g();

//in form 2:
//constructor
public Form2( Form1 parent) { this.parentForm = parent;}

// in a method
parentForm.Publ icProperty = "what ever value";
2- make tha value accesible to form1 as a public property:
// in form 1
form2 = new Form2( this);
form2.ShowDialo g();
form1.receivedv alue = form2.PublicPro perty;

3- Make a static public property in form1 , this is the last resort,

//form1
public static string A_Property { get.. set }

//form2
//inside a method:
//note I use the Form1 type, not any instnace
Form1.A_Propert y = "a value" ;
cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation
"Jason Huang" <Ja************ @hotmail.com> wrote in message
news:%2******** *******@TK2MSFT NGP15.phx.gbl.. .

Hi,

Thanks for help in advance!
In Form1, I "New" a Form2 and ShowDialog the Form2, it's OK.
My intention is passing a value from Form2 to Form1.
However, in Form2, I shouldn't "New" a Form1, 'cuz it will open a new
Form1, the new Form1 will get the value. And the original Form1 get
nothing!
What do I need to do to let the ORIGINAL Form1 get the target value?
Any help will be highly appreciated.

Jason