Allowing only Integer value in a textbox in c#

Question

3.67/5 (2 votes)

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Hello, I want allow only to enter Integer value in a textbox with no decimals/points/dot in C#. Till now I did this far. Can someone assist me on this. would be a great help. Now I just need to prevent the decimal part.

C#

private void Quantity_txt_KeyPress(object sender, KeyPressEventArgs e)
        {
            char ch = e.KeyChar;
            if (!Char.IsDigit(ch) && ch != 8 && ch != 46) 
            {
                e.Handled = true;
            }
        }

Posted 14-May-14 0:32am

User 10744971

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4 solutions

Solution 3

You could use a NumericUpDown control assuming this is a Windows Forms based application.

Posted 14-May-14 0:54am

dan!sh

Solution 4

C#

private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
e.Handled = ((new Char[] {'0','1','2','3','4','5','6','7','8','9'}).ToList<Char>()).Contains(e.KeyChar)?false:true;

//you can either change it to 
e.Handled = char.IsDigit(e.KeyChar) ? false : true;

}

Posted 14-May-14 2:10am

balajidileepkumar

Updated 14-May-14 2:13am

v2

Comments

CHill60 14-May-14 8:19am

Or even e.Handled = !char.IsDigit(e.KeyChar); as IsDigit returns a Boolean anyway

Solution 2

Use ajax it's so simple to apply validate control.
Put ajax FilterTexboxExtender and choose FilterType="Numbers" Then you will get only interger value

<ajaxtoolkit:toolkitscriptmanager id="ajsm"  runat="server" ></ajaxtoolkit:toolkitscriptmanager>
<asp:textbox id="TextBox1" runat="server" ></asp:textbox>
<ajaxtoolkit:filteredtextboxextender id="fteIn"  runat="server" targetcontrolid="TextBox1" filtertype="Numbers" >  </ajaxtoolkit:filteredtextboxextender>

Posted 14-May-14 0:39am

sankarsan parida

Updated 14-May-14 0:40am

v2

Comments

phil.o 14-May-14 6:47am

Seeing OP's question, it is a Windows Forms project.
Ajax is not relevant in this case.

[no name] 14-May-14 6:53am

good

[no name] 14-May-14 10:20am

Yes #phil.o its a Windows Forms Apps. And I also don't think Ajax is relevant over here. Anyways, I got the solution already. <br>
`private void Quantity_txt_KeyPress(object sender, KeyPressEventArgs e)
{
char ch = e.KeyChar;
if (!Char.IsDigit(ch) && ch != 8)
{
e.Handled = true;
}
}`

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OriginalGriff · Accepted Answer · 2014-05-14T00:34:00

Solution 1

So stop allowing it through: remove the && ch != 46 part which allows '.'

Posted 14-May-14 0:34am

OriginalGriff

Comments

[no name] 14-May-14 6:43am

Thanks Man. It worked.

OriginalGriff 14-May-14 6:58am

You're welcome!