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Hi,
I keep getting an error when I try to insert a new record into a table (SQL 2000) that has a column that I've configured as 'Unique Null Allowed'. I used Visual Studio (2003) IDE SQL Data Adapter Wizard to create the stored procedures, data adapter, and dataset using a simple select statement with one paramater. Everything works fine except the 'Unique Null Allowed' column requires a value on Insert or I get an error. What am I doing wrong?
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If you have a column which is Unique and Allow nulls then
only one record will be allowed to have null value in this columns because if other record was inserted with null value in this unique columns it will not be allowed because this column is unique and other record already have null value in this column
MCAD
-- modified at 20:54 Friday 2nd September, 2005
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I want to filter out some email address from a block of text. currently i use something like this which i found over internet.
[\\w]+@[\\w]+.[\\w]{2,3}
but it doesn't pick all email address, like some.one@some.ac.in
can u help me,
thanks,
Derick
Visit my tech blog http://techcapsules.blogspot.com
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You have to include some more characters in order to catch all valid email addresses:
[\w\-%~\.]+@[\w\-\.]+\.[\w]{2,4}
This will only match strictly standard conformant email adresses, though. You might want to include even more characters, as some people have email adressed that does not conform to the standard.
---
b { font-weight: normal; }
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Try this
string s = @"^(([A-Za-z0-9]+_+)|([A-Za-z0-9]+\-+)|([A-Za-z0-9]+\.+)|([A-Za-z0-9]+\++))*[A-Za-z0-9]+@((\w+\-+)|(\w+\.))*\w{1,63}\.[a-zA-Z]{2,6}$";
Regex ex = new Regex(s);
Match match = ex.Match("g_s+gavcom.com");
if ( match.Success )
{
MessageBox.Show("Found");
}
Live Life King Size
Alomgir Miah
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In VS 2003, I used CaptionText in DataGrid control. I have migrated my form
in VS 2005 using DataGridView. Does DataGridView has CaptionText property.
How do I accomplish this task if the property does not exist? Any alternate
way of setting CaptionText or Title of the DataGridView?
Help appreciated.
Thanks
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hi,
how can i get the selected text from address bar in Internet Explorer programe.
i try slove these problem use hook techel but i fail.
can anyone help me......
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I cant seem to get this code to work. I need populate a combobox with items that have separate values. For instance: When the user selects "item" within the combobox the "value" associated with that item will be displayed in a textbox.
private void Form1_Load(object sender, System.EventArgs e)
{
ComboBox c = new ComboBox();
c.Items.Add(new MyItem("Item", "Value"));
textBox1.Text = ((MyItem)c.SelectedItem).Content;
}
class MyItem
{
private string item; // String to show in the ComboBox
private string val; // String to show in the TextBox
public MyItem(string i, string v)
{
item = n;
val = v;
}
public override string ToString()
{
return item;
}
public string Content
{
get
{
return val;
}
}
}
It doesn't seem to like this bit of code:
textBox1.Text = ((MyItem)c.SelectedItem).Content;
Error: Object Reference not set to an instance of an object
Any help would be appreciated.
Thanks
-- modified at 12:54 Friday 2nd September, 2005
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That is because the SelectedItem property is null, as the user has not yet selected a value.
You have to wait until the user has selected a value before you can check what the users selected.
---
b { font-weight: normal; }
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Sometimes it is that easy. Thanks for the help
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All of my efforts to add items to display in the combobox fail; I've added items using the IDE in VS2003 (String Collection Editor) or programtically and all I get is an empty drop down list that gets longer. The project compiles and I get no errors but my application only shows an empty drop down list. Can someone please tell me what I'm doing wrong?
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I had this problem for awhile - it was due to McAfee virus scan "Buffer Overflow protection". McAfee had a fix on thier site.
If this is not your problem, sorry.
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Thank you so very much for your help; you were dead on target. I disabled the overflow protection and the code works. Now all I have to do is go around and pick up all my torn hair.
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Glad I could help. I had a bunch of code across my network suddenly generating empty List & Combo boxes. My hair still hasn't grown back.
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has anyone come across an implementation of UNIX style wildmat pattern matching C#. I have searched all over but couldnt seem to find anything.
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Not that I know of. The .NET framework class library has full support for regular expressions, though, in the System.Text.RegularExpressions namespace.
Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Cops & Robbers
Judah Himango
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how can i find out the location of the current class?
would application.startup path work?
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Classes don't necessary reside in a directory. The code file for the class does, sure, but that may not be what you want. Application.StartupPath will give you the directory from which the executable started, excluding the file name of the executable.
Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Cops & Robbers
Judah Himango
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System.Reflection.Assembly.GetExecutingAssembly().Location
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System.Reflection.Assembly.GetEntryAssembly().Location
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how i can i remove all the chr(10) and all the chr(13) at the end of a string.
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To remove newline from the end of string or other chars from the end of string
int pos=textBox1.Text.LastIndexOf(Environment.NewLine);
if (pos !=-1)
{
string text;
text=textBox1.Text.Remove(pos,Environment.NewLine.Length);
textBox1.Text=text;
}
Note: check the pos+length to insure that this he end of
string not just last newline in string
MCAD
-- modified at 10:51 Friday 2nd September, 2005
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myText = myText.Replace("\r\n", "\r");
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You could do a couple things: find the index of each undesired character using theString.IndexOf method, then remove that character using theString.Remove(index, 1). This method, while fairly simple to do, will cause lots of string allocations; for each string.Remove call, a new string will be created. Another way of doing this is to create a System.Text.StringBuilder using your string, then doing a strBuilder.Replace call to replace undesired characters with empty characters.
Perhaps the most efficient way of doing this would be to use a regular expression to swap out the undersireable characters from the end of the string. If you need help creating a regular expression, I recommend this website[^].
Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Cops & Robbers
Judah Himango
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The tab character is chr(9). I assume that you want to remove the newline combination CR+LF, e.g. chr(13)+chr(10).
One way is to look for it at the end of the string, and remove them as long as there are any:
while (myString.EndsWith(Environment.NewLine)) myString = myString.Substring(0, myString.Length - Environment.NewLine.Length);
This works fine if there is just one or a few newline at the end of the string. If you expect to encounter a lot of newlines, you may want to find out how many there are before you remove them, as string manipulations are relatively slow.
---
b { font-weight: normal; }
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