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Dropdownlist

 
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  #1
Jul 3rd, 2009
Hi,
I want to display a text, getting from database, into a DropdownList using text property.

My Code::

ASP.NET Syntax (Toggle Plain Text) 
  1. SqlDataReader drd; 
  2. if (drd.Read())
  3. {
  4. 	drpcompname.Text  = drd.GetValue(0).ToString();
  5.  
  6. }

But It Display an error::

'drpcompname' has a SelectedValue which is invalid because it does not exist in the list of items.
Parameter name: value

Please help me.

Thanks!
Pankaj Singh
Last edited by Ezzaral; Jul 3rd, 2009 at 1:00 pm. Reason: Added [code] [/code] tags. Please use them to format any code that you post.
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Re: Dropdownlist

 
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  #2
Jul 3rd, 2009
Welcome Pankaj18,

Your source code must be surrounded with bb code tags. Read this How to use bb code tags?

Error message shows that a value you are assigned to the DropDownList control is not present inside the DropDownList's items.
Yes, the DropDownControl is empty. Isn't it?

Here, I am using bb code tags - See, how a source looks !!!
ASP.NET Syntax (Toggle Plain Text) 
  1.    SqlDataReader drd; 
  2.    .....
  3.    if (drd.Read())
  4.      {
  5.         drpcompname..Items.Add(drd.GetValue(0).ToString());
  6.      }
Failure is not fatal, but failure to change might be. - John Wooden
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Re: Dropdownlist

 
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  #3
Jul 3rd, 2009
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Originally Posted by adatapost View Post
Welcome Pankaj18,

Your source code must be surrounded with bb code tags. Read this How to use bb code tags?

Error message shows that a value you are assigned to the DropDownList control is not present inside the DropDownList's items.
Yes, the DropDownControl is empty. Isn't it?

Here, I am using bb code tags - See, how a source looks !!!
ASP.NET Syntax (Toggle Plain Text) 
  1.    SqlDataReader drd; 
  2.    .....
  3.    if (drd.Read())
  4.      {
  5.         drpcompname..Items.Add(drd.GetValue(0).ToString());
  6.      }
I want to display at runtime not add
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Re: Dropdownlist

 
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  #4
Jul 3rd, 2009
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Originally Posted by Pankaj18 View Post
I want to display at runtime not add
drpcompname..Items.Add(drd.GetValue(0).ToString());
the above code add the items ,not display......
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Re: Dropdownlist

 
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  #5
Jul 3rd, 2009
Does your dropdownlist contains items? If yes then use
ASP.NET Syntax (Toggle Plain Text) 
  1. drpcompname.SelectedValue=drd.GetValue(0).ToString();
Failure is not fatal, but failure to change might be. - John Wooden
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Re: Dropdownlist

 
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  #6
Jul 4th, 2009
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Originally Posted by adatapost View Post
Does your dropdownlist contains items? If yes then use
ASP.NET Syntax (Toggle Plain Text) 
  1. drpcompname.SelectedValue=drd.GetValue(0).ToString();
but it displays the same error::
drpclienttype' has a SelectedValue which is invalid because it does not exist in the list of items.
Parameter name: value

help me..

Pankaj Singh
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Re: Dropdownlist

 
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  #7
Jul 4th, 2009
First, fill the dropdownlist with values.
Failure is not fatal, but failure to change might be. - John Wooden
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Re: Dropdownlist

 
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  #8
Jul 4th, 2009
Thanks.
But it working when dropdownlist have some values, i have another case when i have no items in dropdownlist,it have only one item 'Select One', it display same error::
'drpcompname' has a SelectedValue which is invalid because it does not exist in the list of items.
Parameter name: value

Thanks!

Pankaj Singh
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Re: Dropdownlist

 
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  #9
Jul 4th, 2009
Thanks,

Please, Mark this thread as Solved if you get solution.
Failure is not fatal, but failure to change might be. - John Wooden
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Re: Dropdownlist

 
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  #10
Jul 4th, 2009
If dropdownlist has no items (values) then you cannot assign a value for selection. This is the fact. Do not assign value if dropdown is empty.
Last edited by adatapost; Jul 4th, 2009 at 5:56 am. Reason: Typo
Failure is not fatal, but failure to change might be. - John Wooden
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