Help with text boxes

Question

Hi to all of you.I am totaly newbie in c# Visual studio.
ok here is the my problem
i must for homework do next.
i have 5 text box on form.a,b,c,d,e
in all of them i only must type NUMERIC format not letters.
now i must do next
mathematic > b/a = M
d/c= N

and then automaticly must show in e this result.
e=(1-(N/M))*100

can you understand my problem and can you please help me.
thank you. and sorry about bad english,

Rachit Patel · Answer

Hi Friend Below function help your enter only decimal value in textbox. /***************************************************************************** 10.This function is used to Check for Currency entry in Textbox/Textarea/select box for the Empty Maximum value Note1:If Required is set to falsethen it validates only if you enter in the input boxes. Ex: fnCheckCurrency(document.frmAddEdit.txtCurrencyAmount99999999.99true); ******************************************************************************/ /************************ UPDATED BY CHITAL ON 31st October 2006 ****************************/ function fnCheckCurrency(ObjectNameObjectCaptionMaxValRequired){ var strErr =  ObjectName=eval(ObjectName) if(ObjectName.value.substring(01) == $) { ObjectName.value=ObjectName.value.substring(1ObjectName.length); } if(ObjectName.value == 0.00){ l = 0; }else{ l = ObjectName.value.length; } if (Required==true ||(Required==false && l>0)){ if(ObjectName.value.length { ObjectName.value=0; } else { var curEntered = ObjectName.value; if (isNaN(curEntered)||fnIsEmpty(curEntered)){ strErr = ObjectCaption +   + strErrValidCurrency +  
\  ; } else if (curEntered strErr = ObjectCaption +   + strErrNegativeValue +  
\  ; } else{ curEntered = parseFloat(curEntered) if (curEntered > MaxVal){ strErr = ObjectCaption +   + strErrExceed +   + MaxVal +  
\  ; } } } if (strErr != ){ strErrMessage = strErrMessage + strErr; if ((objFocus == undefined)||(objFocus == )){ objFocus = ObjectName } } }else{return true;} }

Aleksandar Ilioski · Answer

result = (1-(N/M)*100;// old code result = Math.Sqrt(result);// new code textBox5.Text = result.ToString();// old code that is all

Marin Jurca · Answer

ok now is the continious with program. i must sqrt finish result? how to do that?

Aleksandar Ilioski · Answer

You are wellcome

Marin Jurca · Answer

thank you. my program is working.

Aleksandar Ilioski · Answer

here one more picture where you can see wyat is your problem: http://volci.freehostia.com/Rar/Slika1.jpg please write on this post when you download the picture so I can remove both files from the server I don't have enought space for my needs...

Marin Jurca · Answer

Thanks for your helping but it does not work. try it in your program a = 16 b = 42 c = 17 d = 41 result in textbox.5 must be 8.12 %

Aleksandar Ilioski · Answer

I have made simular project to yours and you can download it at: http://volci.freehostia.com/Rar/tb.rar hope that will help you...

Marin Jurca · Answer

Here is the screen shot. What i must type in to declare variables. thanks for answer. here is the ss http://img160.imagevenue.com/img.php?image=23219_kako_122_1103lo.JPG

Aleksandar Ilioski · Answer

you must convert the text in the textbox to int or double and than do the mathematics like this... int n1 = Convert.ToInt32(a.Text); int n2 = Convert.ToInt32(b.Text); than you can for example do: int n3 = n1+n2; c.Text = n3.ToString(); Where a b and c are Type of TextBox Hope this will help you