How can i check the given string is integer or not

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Hi i am getting a string value in the given format

1)abc<br />
2)abc23232<br />
3)1,23232<br />
4)1221<br />
5)-32323

now how can i check
1)whether the string has integer value and
2)if it has interger value how i can check whether it is negative or not

Posted 2-Jan-12 0:19am

lakshmichawala

Updated 2-Jan-12 0:23am

Rajesh Anuhya

v2

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lakshmichawala 2-Jan-12 7:37am

Tanks for solution .if is negative how can i convert the value in the bleow format -4567.890 to (4567.890)

4 solutions

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Rajesh Anuhya · Answer 1 · 2012-01-02T00:22:00

Solution 1

use this..
Int32.Parse[^]

Posted 2-Jan-12 0:22am

Rajesh Anuhya

Updated 2-Jan-12 0:27am

v2

CPallini · Answer 2 · 2012-01-02T00:24:00

Solution 2

(1) There's the Int32.TryParse[^] method for that (please read the documentation).
(2) Once TryParse returns true you have the integer and you may test if it is less than zero.

Posted 2-Jan-12 0:24am

CPallini

Supriya Srivastav · Answer 3 · 2012-01-02T00:28:00

Solution 3

Try this,

C#

int checkNumber;
if (int.TryParse(TextBox2.Text, out checkNumber) == false)
{
    //Entered number is not interger;
}
else
{
    if (Convert.ToInt16(TextBox2.Text) < 0)
    {
        //Entered no. is negative
    }
    else
    {
        //Entered no. is positive
    }
}

Posted 2-Jan-12 0:28am

Supriya Srivastav

Comments

lakshmichawala 2-Jan-12 7:36am

Thanks for ur solution .if is negative how can i convert the value in the bleow format -4567.890 to (4567.890)

Supriya Srivastav 3-Jan-12 1:09am

absolute value can be calculate by,
decimal val = Math.Abs(Convert.ToDecimal(TextBox1.Text));

Supriya Srivastav 3-Jan-12 1:47am

If it solved your problem,then mark it as solved.
Thanks.

RaviRanjanKr · Answer 4 · 2012-01-02T08:50:00

Solution 4

Try

C#

public bool isNumeric(string val, System.Globalization.NumberStyles NumberStyle)
{
    Double result;
    return Double.TryParse(val,NumberStyle,
        System.Globalization.CultureInfo.CurrentCulture,out result);
}

Posted 2-Jan-12 8:50am

RaviRanjanKr