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integer textbox not accept null value
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if (txt_CheqNo.Text == "")
                {
                    objdal.Cheq_No =Convert.ToInt16("");
                }
                else
                {
                    objdal.Cheq_No = Convert.ToInt16(txt_CheqNo.Text);
                }
i have textbox wich store numeric value.
but when textbox i leave empty,it creates error.
error:Input string was not in a correct format.
 
i have to not put requierfield to fill textbox.i have the situation in many case to leave it empty.i have to keep it complatly blank.Not '0' or anything else to enter in it.
 
how to solve this?
 
Posted 24 Feb '13 - 23:14
Member 9511889660
Edited 24 Feb '13 - 23:22
v3
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Comments
Vardhan Desai - 25 Feb '13 - 5:18
Have you given any condition for Numeric if yes then Let me see that codes.

5 solutions

Simple: don't try to do a convert:
if (txt_CheqNo.Text == "")
    {
    objdal.Cheq_No = 0;
    }
else
    {
    objdal.Cheq_No = Convert.ToInt16(txt_CheqNo.Text);
    }
But a better way would be:
objdal.Cheq_No = 0;
if (!string.IsNullOrWhiteSpace(txt_CheqNo.Text))
    {
    objdal.Cheq_No = Convert.ToInt16(txt_CheqNo.Text);
    }
  Permalink  
Posted 24 Feb '13 - 23:31
OriginalGriff739K
Comments
Member 9511889 - 25 Feb '13 - 5:35
i have to not insert '0' or anything else in it.
OriginalGriff - 25 Feb '13 - 5:55
Either you assign it a value, or you don't - int datatypes *always* have a value, unless they are declared as nullable (which is very unusual). You could just "leave it alone" and not assign it a value, but that is likely to cause even more problems as it will retain the previous value.
Jegan Thiyagesan - 25 Feb '13 - 5:48
Hi, "int" is a primitive type and it will always have a value, you cannot assign null to a primitive type. if you want you can make your "objdal" to a nullable "Integer" type or a "string" type. Regards Jegan
visit this link it might help you.
this also traps other non numeric inputs
 
http://social.msdn.microsoft.com/forums/en-US/winforms/thread/84990ad2-5046-472b-b103-f862bfcd5dbc/[^]
  Permalink  
Posted 24 Feb '13 - 23:40
ZaneArellano708
best way is below written code which will not give parser error.
 
Int16 _cheq_No;
Int16.TryParse(txt_CheqNo.Text, out _cheq_No);
objdal.Cheq_No = _cheq_No;
  Permalink  
Posted 25 Feb '13 - 0:02
S R JHALA895
Edited 25 Feb '13 - 0:04
v3
If you want to set null values then you can do like this
but objdal.Cheq_No should be nullable.
if (txt_CheqNo.Text == "")
{
objdal.Cheq_No =null;
}
else
{
objdal.Cheq_No = Convert.ToInt16(txt_CheqNo.Text);
}
 
Other wise dont convert when text box is null or empty.
if (txt_CheqNo.Text != "")
{
objdal.Cheq_No = Convert.ToInt16(txt_CheqNo.Text);
}
  Permalink  
Posted 25 Feb '13 - 0:54
Shobhana.n716
Edited 25 Feb '13 - 0:56
v2
try this one
If txtMRNO.Text.Length = 0 Then
          code here
       End If
  Permalink  
Posted 25 Feb '13 - 1:02
raj ch2.3K
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