How to avoid first character as a space in TextBox

Question

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In the following code I want to stop the proceeds if someone enters 'space' as a first character.
If the first character is a space, is it possible to assign the value to variable v_MyAddressStreet as "" (blank).
I dont want to use 'Required field validation'

C#

protected void TextBox10_TextChanged(object sender, EventArgs e)   // MyAddress Street
   {

       v_MyAddressStreet = TextBox10.Text;
       if (v_MyAddressStreet == "")
       {
           RBL7clear();
       }
   }

Posted 23-Nov-13 1:04am

S.Rajendran from Coimbatore

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3 solutions

Solution 1

If you mean "I want to know if the string is blank or empty, then there is thew IsNullOrWhiteSpace method:

C#

protected void TextBox10_TextChanged(object sender, EventArgs e)   // MyAddress Street
   {
       v_MyAddressStreet = TextBox10.Text;
       if (string.IsNullOrWhiteSpace(v_MyAddressStreet))
       {
           RBL7clear();
       }
   }

If the field is null, empty, or just contains spaces the RBL7clear method will be called.

Posted 23-Nov-13 1:10am

OriginalGriff

Comments

S.Rajendran from Coimbatore 23-Nov-13 7:18am

I am using VS2008. 'IsNullOrWhiteSpace' is not available. Only 'IsNullOrEmpty' is available.

OriginalGriff 23-Nov-13 7:27am

You need to tell us these things! :laugh:
Ok, so use IsNullOrEmpty, but use Trim on the textbox first:
v_MyAddressStreet = TextBox10.Text.Trim();
That removes any whitespace for the beginning and the end.

Solution 2

C#

protected void TextBox10_TextChanged(object sender, EventArgs e)   // MyAddress Street
   {
if(TextBox10.Text!="")
{


       
           RBL7clear();
      
}
else 
{
//show your message
}
   }

Posted 23-Nov-13 1:12am

King Fisher

Updated 23-Nov-13 1:51am

v2

Comments

OriginalGriff 23-Nov-13 7:25am

Reason for my vote of one:
if (a!=b)
if (a==b)
... statement here cannot be executed ...

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ridoy · Accepted Answer · 2013-11-23T01:23:00

Solution 3

I think if you just check v_MyAddressStreet.StartsWith(" "), that will do the trick for you here.It will check if the first character is space or not. Follow this one also:
How to stop the first character in a text box from being space?[^]

Posted 23-Nov-13 1:23am

ridoy

Updated 23-Nov-13 1:25am

v3

Comments

S.Rajendran from Coimbatore 23-Nov-13 7:40am

Thanks. It works.

ridoy 23-Nov-13 7:42am

Glad to help you,:)