How can we unable to entry if first number is 0. Read Below for the detail :

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C#

How can we unable to entry if first number is 0 in textbox. For example :

If anyone enters :

a) 000000000     - not accept
b) 0000001     - accept
b) 0000001002     - accept
b) 0     - not accept
         
If any one have an idea kindly share to me.

Posted 3-Jan-13 19:22pm

Mas11

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3 solutions

Solution 3

try this

C#

if(Convert.ToDouble(TextBox1.Text)==0)
{
//validation
}

Thanks

Posted 3-Jan-13 22:01pm

AshishChaudha

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Mas11 · Accepted Answer · 2013-01-06T17:43:00

Solution 4

I have solved this. Its a minor task !

C#

int idd = Convert.ToInt16(hour_value.text);
          int p = 0;
   if (idd > p)
   {

   }
   else
   {

   }

Posted 6-Jan-13 17:43pm

Mas11

_Amy · Accepted Answer · 2013-01-03T19:32:00

OnBlur of the Textbox call a javascript function say 'fnCheckInput'.

JavaScript

function fnCheckInput()
{
     //Parse it to intger. If the value contains only 0's in that then it'll become 0.
     var controlValue = document.getElementById('TextBox1').value;
     var s = parseInt(controlValue);
     //If the value is 0
     if(s == 0)
     {
          document.getElementById('TextBox1').value = "";//Set empty text to textbox
          return false;
     }
     return true;
}

Here is your HTML:

ASP.NET

<asp:textbox id="TextBox1" runat="server" onblur="return fnCheckInput();" xmlns:asp="#unknown"></asp:textbox>

And also, you need to ensure that only numbers should be entered in TextBox. Use some validation control for that.

--Amit