Data Controls :: Calculate Sum TextBox Values And Display Result

Nov 22, 2013

How to calculate a sum which get the data from a set of textboxes in asp.net page? Can write in code behind c#? Can assign the textbox value to a variable then calculate the sum at code behind them show the answer to the asp.net page? Or is it have to write javascript to perform those action?

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Dec 19, 2012

I have 1 gridview

In gridview there are 4 asp textbox

textbox 1 = key in number
textbox 2 = key in number
textbox 3 = key in number
textbox 4 = total

How do I sum all the value that are key in  from textbox 1 to 3 and automatically display in textbox 4.

Let say:

textbox 1 = 1
textbox 2 = 2
textbox 3 = 4

total:

textbox 4 = 7

if I key in one of the textbox , the value also appear in textbox 4

textbox 1 = 1
.
.

automatically appear textbox 4 = 1
.
.

textbox 2 = 2
.
.

automatically appear textbox 4 = 3 ...

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[CODE]...

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[Code].....

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[code]....

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[Code]....

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[Code].....

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Jul 17, 2015

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[code]...

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[Code] .....

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Here is the aspx page:

[Code]....

And the code behind page with working "Calculate" as long as fields are not left blank (I took out all the test code that made it not work at all)

[Code]....

Finally, the error message I am getting is the following:

[Code]....

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