converting data types

[Scott]

How do I convert the contents of a textbox to a double for mathmateical
operations? I'm using a form to collect values and when the user clicks OK,
the vlaues are used for calcualtions... but they need to be double data type.
Then, after the calculations, how to do I convert the double back into the
data type needed by the textbox control?

Thanks,
Scott

[e-lores]

double aux = Int64.Parse(textbox.Text);
aux += aux;
textbox.Text = aux.ToString();

I hope this help you.
Ernesto Lores (Bcn)

"Scott" <Sc***@discussions.microsoft.com> escribió en el mensaje
news:36**********************************@microsof t.com...

How do I convert the contents of a textbox to a double for mathmateical
operations? I'm using a form to collect values and when the user clicks OK, the vlaues are used for calcualtions... but they need to be double data type. Then, after the calculations, how to do I convert the double back into the
data type needed by the textbox control?

Thanks,
Scott

[Joel Ross]

Scott,

You can use double.Parse(textbox.Text) to convert it to a double, and then
use textbox.Text = answer.ToString()

Is that what you need?

Joel
http://www.rosscode.com

"Scott" <Sc***@discussions.microsoft.com> wrote in message
news:36**********************************@microsof t.com...

How do I convert the contents of a textbox to a double for mathmateical
operations? I'm using a form to collect values and when the user clicks OK, the vlaues are used for calcualtions... but they need to be double data type. Then, after the calculations, how to do I convert the double back into the
data type needed by the textbox control?

Thanks,
Scott

[Scott]

Thanks. That worked...

"e-lores" wrote:

double aux = Int64.Parse(textbox.Text);
aux += aux;
textbox.Text = aux.ToString();

I hope this help you.
Ernesto Lores (Bcn)

"Scott" <Sc***@discussions.microsoft.com> escribió en el mensaje
news:36**********************************@microsof t.com...

How do I convert the contents of a textbox to a double for mathmateical
operations? I'm using a form to collect values and when the user clicks

OK,

the vlaues are used for calcualtions... but they need to be double data

type.

Then, after the calculations, how to do I convert the double back into the
data type needed by the textbox control?

Thanks,
Scott

[e-lores]

double aux = double.Parse(textbox.Text) ;
is the correct form.

(Int64 is used to convert to long integer)
"e-lores" <e_*****************@yahoo.es> escribió en el mensaje
news:es**************@TK2MSFTNGP09.phx.gbl...

double aux = Int64.Parse(textbox.Text);
aux += aux;
textbox.Text = aux.ToString();

I hope this help you.
Ernesto Lores (Bcn)

"Scott" <Sc***@discussions.microsoft.com> escribió en el mensaje
news:36**********************************@microsof t.com...

How do I convert the contents of a textbox to a double for mathmateical
operations? I'm using a form to collect values and when the user clicks

OK,

the vlaues are used for calcualtions... but they need to be double data

type.

Then, after the calculations, how to do I convert the double back into the data type needed by the textbox control?

Thanks,
Scott

[Scott]

Thanks for help! The code I wrote is below. So far, everything is working
just fine...

double bearingOne = double.Parse(textBox1.Text) ;
double bearingTwo = double.Parse(textBox2.Text) ;
double angleBetween = bearingOne + bearingTwo ;

textBox3.Text = angleBetween.ToString() ;

Thanks,
Scott

"Joel Ross" wrote:

Scott,

You can use double.Parse(textbox.Text) to convert it to a double, and then
use textbox.Text = answer.ToString()

Is that what you need?

Joel
http://www.rosscode.com

"Scott" <Sc***@discussions.microsoft.com> wrote in message
news:36**********************************@microsof t.com...

How do I convert the contents of a textbox to a double for mathmateical
operations? I'm using a form to collect values and when the user clicks

OK,

the vlaues are used for calcualtions... but they need to be double data

type.

Then, after the calculations, how to do I convert the double back into the
data type needed by the textbox control?

Thanks,
Scott

[Maqsood Ahmed]

Any thoughts about when user doesn't enter a valid real number?? :)
Please explore Double.TryParse method

Maqsood Ahmed
Kolachi Advanced Technologies
http://www.kolachi.net

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[Scott]

I recognize the need to add some form of input validation but, since I'm new
to c#, I still need to figure oout that part. I'm collecting the values from
textboxes on a form and would prefer to throw a message / flag instructing
the user to enter a valid value.

Any suggestions / code samples are greatly appreciated.

Thanks,
Scott

"Maqsood Ahmed" wrote:

Any thoughts about when user doesn't enter a valid real number?? :)
Please explore Double.TryParse method

Maqsood Ahmed
Kolachi Advanced Technologies
http://www.kolachi.net

*** Sent via Developersdex http://www.developersdex.com ***
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[e-lores]

Maybe you can use ...

1. ... KeyPress event (you control key by key)
2. ... Validating event (you control the value inserted)

Ernesto Lores (Bcn)
"Scott" <Sc***@discussions.microsoft.com> escribió en el mensaje
news:88**********************************@microsof t.com...

I recognize the need to add some form of input validation but, since I'm new to c#, I still need to figure oout that part. I'm collecting the values from textboxes on a form and would prefer to throw a message / flag instructing
the user to enter a valid value.

Any suggestions / code samples are greatly appreciated.

Thanks,
Scott

"Maqsood Ahmed" wrote:

Any thoughts about when user doesn't enter a valid real number?? :)
Please explore Double.TryParse method

Maqsood Ahmed
Kolachi Advanced Technologies
http://www.kolachi.net

*** Sent via Developersdex http://www.developersdex.com ***
Don't just participate in USENET...get rewarded for it!