Text Box Validation With Two Textboxes

Question

How can i check if a text in of one textbox is equal to or greater than the text in another textbox ?

I have tried range validator and compare validator but cant get anything to work.

Did you heard about custom validator use client side scripts to validate this sort of things... https://msdn.microsoft.com/en-IN/library/9eee01cx(v=vs.71).aspx — Sankar, Dec 07 '16 at 05:47
I want to compare numbers can you please post the code. @ManojNaik — Swornim Nepal, Dec 07 '16 at 05:49
@SwornimNepal It seems that you are using .net framework 4.5 .JFYI, CompareValidator Control will work upto .net framework 4. If you want to use this control then you have to use .net framework 4 or else find any other alternatives of CompareValidator control. — Manoj Naik, Dec 07 '16 at 06:51

score 0 · Accepted Answer · answered Dec 07 '16 at 05:54

0

C#:

double a = Convert.ToDouble(TextBox1.Text);
double b = Convert.ToDouble(TextBox2.Text);

if (a == b)
{
    // Do things
}

ASP: https://forums.asp.net/t/1793666.aspx?Compare+two+numeric+text+box

answered Dec 07 '16 at 05:54

Essigwurst

555
10
24

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thanks but what if i want to write a validation expression ? – Swornim Nepal Dec 07 '16 at 06:03
`if (a == b) TextBox3.Text = "equal"; else if (a > b) TextBox3.Text = "a > b";` – Essigwurst Dec 07 '16 at 06:34

score 0 · Answer 2 · edited May 23 '17 at 12:13

You need to use CompareValidator, and fill the ControlToValidate and ControlToCompare with your Textboxes IDs as below :

<asp:CompareValidator 
       ID="cvEndYear2" Operator="GreaterThanEqual" runat="server"
       ValidationGroup="Validate" ControlToValidate="YourFirstTextBoxID"  
       ControlToCompare="YourSecondTextBoxID" ErrorMessage="" SetFocusOnError="true">
</asp:CompareValidator>

You can have a look at this and this .

score 0 · Answer 3 · answered Dec 07 '16 at 07:48

0

        if (double.Parse(TextBox1.Text) > double.Parse(TextBox2.Text))
        {
            // 1 greater than 2
        }
        else
        {
            // 1 less than or equal to 2
        }

answered Dec 07 '16 at 07:48

Terry Lennox

29,471
5
28
40

Text Box Validation With Two Textboxes

3 Answers3