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I require to disable/enable check box in a property grid dynamically at runtime using C# .NET.
I was able to to disable/enable the Check box at runtime. But the problem is If I enable check box dynamically I am no longer able to select the check box. I am using TypeConvertor and UITypeEditor together to disable/enable the check box at runtime.
If I do not use TypeConvertor with UITypeEditor then I am able to select the check box.
Can anyone faced this problem ?
I am using the following Code piece:
[TypeConverter(typeof(myConverter))]
[Editor(typeof(CheckBoxInPropertyGridEditorCapex), typeof(System.Drawing.Design.UITypeEditor))]
public bool ValidForCapex
{
get { return validForCapex; }
set { validForCapex = value; }
}
public class CheckBoxInPropertyGridEditorCapex : UITypeEditor
{
public override bool GetPaintValueSupported(ITypeDescriptorContext context)
{
return true;
}
public override void PaintValue(PaintValueEventArgs e)
{
ControlPaint.DrawCheckBox(e.Graphics, e.Bounds, ((GeneralDimensionClass)e.Context.Instance).validForCapex ? ButtonState.Checked : ButtonState.Normal);
}
}
public class myConverter : StringConverter
{
public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
{
if (ValidForCapexRead == true)
{
return false;
}
return base.CanConvertFrom(context, sourceType);
}
public override bool CanConvertTo(ITypeDescriptorContext context,
System.Type destinationType)
{
return base.CanConvertTo(context, destinationType);
}
}
Rajan
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please someone help me. I need to write codes for how may days til christmax.
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There is a complex formula for calculating that. It isn't hard to implement, just use your best friend. GOOGLE.
The best way to accelerate a Macintosh is at 9.8m/sec² - Marcus Dolengo
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DateTime xmas = new DateTime(2007, 12, 25);
Console.WriteLine(xmas.Subtract(DateTime.Today).Days); This is simple enough since all you need to do is basic date arithmetic and subtract today's date from 12/25/2007.
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hey thanks so much guy that was very helpful. I am really new to programming. thanks again.
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Congrats, you just did this guys homework.
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Oh well...every once in a while a homework question will slip by me. If it was homework, he still won't have an easy time passing the class if he's stumped on something that simple.
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I want to check whether the user is able to connect to a host specified with given user name and password or not in network.
I used NetWorkCredential class but with that I am unable to validate the user name and password.
Can any one suggest me a way to do the same.
Thanks in advance.
Best Regards,
M. J. Jaya Chitra
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Why am I getting this error? My stored procedure is returning the value of an int column...
try {
SqlDataReader r = run_sql_reader(sql);
if (r.Read()) {
LB_CO_record_number.Text = (r.GetInt32(0)).ToString(); //***exception here
}
r.Close();
} catch (Exception ex) {
MessageBox.Show(ex.Message);
}
Visual Studio is not telling me what is trying to be casted to what else, so I can't figure out which thing is causing the error. I do this kind of thing all the time and I've never gotten this error.
"Quality Software since 1983!"http://www.smoothjazzy.com/ - see the "Programming" section for freeware tools and articles.
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Mmmmkay... I figured it out. My proc was for some reason not returning an int column. I don't know what it was returning, but using "convert" on the value before sending it back fixed the problem. Crazy computers
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By any chance did you get a NULL returned from the database. Attempting to convert NULL to another might succumb with System.InvalidCastException: The specified cast is invalid.
Vasudevan Deepak Kumar
Personal Homepage
Tech Gossips
Yesterday is a canceled check. Tomorrow is a promissory note. Today is the ready cash. USE IT.
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No it returns a number, which I verified, but it's good to know that. I'll add some code to check for that. Thanks!
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How to code in C# calling the stored procedure with no parameter.
Inside my stored procedure is just to delete specified column.
thanks,
******************************
I just want to
know everything
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Please post the code that you tried and is not working. It should be a simple call...
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Create an instance of SqlCommand class and set command text to the name of the stored procedure. Don't forget to set the type of the command to. You can then execute it by calling ExecuteNonQuery() method
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following namespace not found :-
Microsoft.Office.Interop.Excel.ApplicationClass
Gaurav
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Make sure you have added the assembly in your references in your project. Otherwise, please post more information.
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creating and saving excel work sheet at runtime
Gaurav
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G.K.M. wrote: creating and saving excel work sheet at runtime
And I'm eating vanilla ice-cream generously poured over an apple turnover. Yum! 
/ravi
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Is there a way to implement a "read only" struct whose fields are directly readable but not writable?
The examples I'm seeing all make the struct fields private, and then implement a method to read them. So, instead of using
myHours = TimeStruct.Hours;
they all force
myHours = TimeStruct.Hours();
I'd prefer to have it work the first way, but not allow the caller to change the field value. IE,
TimeStruct.Hours = 12;
would fail or throw an exception or simply not be possible.
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You're reading the wrong examples. Use either readonly fields
public readonly int Hours ;
or readonly properties
private int hours ;
public int Hours { get { return hours ; } }
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Ooohhhh.... tasty.
Damn these C# books! I suppose they were really just telling me to control access to the fields, but still... can't they assume I'm relatively dumb?
[modified] Forgot to say "thanks". Thanks!
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"C# For Dummies" is good.
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Actually, I have to say: I hated that one. The hoaky tip titles and non-programming content just drove me crazy.
Microsoft Visual C#2005: Step by Step is pretty good, but it limits itself. The writing, though, is very clear.
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JoeRip wrote: Is there a way to implement a "read only" struct whose fields are directly readable but not writable?
Just to add to what PIEBALDconsult said. It sounds like what you are wanting to do is create an "immutable" object (unless you have some other mechanism where you update the fields). An immutable object is one that once created does not change. Typically, if you want to change an immutable object you just create a new one.
Strings are an example of immutable objects. If you create a string then call something like ToUpper() on it you get back a new string. The original string is not changed.
(Just to add to your vocabulary)
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