[Solved] how to validate a combobox

Solution 2

You can try this:

public bool valcombo()
{
   //It will prevent space in begin, End and double space within the text
   if (comboBox1.Text.StartsWith(" ")|| comboBox1.Text.EndsWith(" ")|| comboBox1.Text.Contains("  "))
   {
       return true;
   }
   else
   {
       return false;
   }
}

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Posted 18 Nov '12 - 18:33

_Subrata_1.2K

Comments

Shmuel Zang - 19 Nov '12 - 0:47

At first thought, I thought about a Regex. But, your solution is more suited to this case. - My 5.

shaikh-adil - 19 Nov '12 - 0:55

i had used regex for that.but whitespace regex is too difficult to develop. but this answer was awsome. +5 thank you sir

Solution 3

You can simply use this.

private Boolean valcombo(){
if ((comboBox1.Text.Length - comboBox1.Text.Trim().Length > 0) ||      
 
(comboBox1.Text.Trim().Length - comboBox1.Text.Trim().Replace(" ", "").Length > 1)) 
            
return true;
            
else
                
return false;    
        }

input               output

" adil shaikh"      true
"adil shaikh "      true
"adil   shaikh"      true
"adil shaikh"      false

Permalink

Posted 18 Nov '12 - 22:24

deepak.m.shrma1.1K

Edited 19 Nov '12 - 17:55

Comments

shaikh-adil - 19 Nov '12 - 7:02

you diditn understood my question. I asked for validation for combo box not the textbox. So where is the textbox1 and textbox2 comes???

deepak.m.shrma - 19 Nov '12 - 23:56

i updated solution now please check. its works same yaar... here its more imp how to deal with string not the element. its works for all element which deals with string :-) hope you will get my point.

shaikh-adil - 22 Nov '12 - 3:44

nice one but i didint understood what you have done. but it is usefull

sariqkhan - 22 Nov '12 - 3:41

+5 but the what does this means? comboBox1.Text.Length - comboBox1.Text.Trim().Length > 0) (comboBox1.Text.Trim().Length - comboBox1.Text.Trim().Replace(" ", "").Length > 1))

deepak.m.shrma - 22 Nov '12 - 5:29

actually i do not use substring or contain method. i actually use .length property of the string. here in ist lin. ie. (comboBox1.Text.Length - comboBox1.Text.Trim().Length > 0) i checked. whether textbox contain space start and ends of the text. if text original length - removing start or end space > 0 its mean it contain space either start of the text or at end. in 2nd line or check. ie. comboBox1.Text.Trim().Length - comboBox1.Text.Trim().Replace(" ", "").Length > 1) i checked that text does not contain more than 2 space between its name and sir name. simple.

Sergey Alexandrovich Kryukov - 19 Nov '12 - 0:38

The statement like if (something) { return true; } else { return false; } shows deep confusion about "if" and condition, and, basically, on how to do simple programming. It should be: return something; //instead! --SA

Sergey Alexandrovich Kryukov - 19 Nov '12 - 0:41

Better allow the user to add any number of leading and trailing blank spaces, only, before validation, work with myComboBox.Text.Trim(). --SA

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how to validate a combobox

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