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You really shouldn't be drawing on the surface of the PictureBox. You should instead be drawing on a Bitmap object, then showing the newly updated bitmap in the PictureBox, or whatever other control your showing it with.
Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007
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hey guys
i m using vb.net and sql server 2000
i want to validate my textboxes in the sence that
whenever i left any of the text box empty,, data dont get stored in database
and i get message that ""fill up form properly"
please help me
i will really appreciate it....
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You can use string.IsNullOrEmpty to check the text of each textbox. Or you can use validators and set them to fail if the control is empty.
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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how do i store RTF text into access database? i need to retrieve that text later on to use in crystal reports....any method????
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RTF is just Text, so you can store it in a Memo field in Access. I don't know what the limitations are on using that in Crystal Reports though since I don't use CR.
Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007
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This code is from javascript as below.
var lunarInfo=new Array(
0x4bd8,0x4ae0,0xa570,0x54d5,0xd260,0xd950,0x5554,0x56af,0x9ad0,0x55d2,
0x4ae0,0xa5b6,0xa4d0,0xd250,0xd295,0xb54f,0xd6a0,0xada2,0x95b0,0x4977,
0x497f,0xa4b0,0xb4b5,0x6a50,0x6d40,0xab54,0x2b6f,0x9570,0x52f2,0x4970,
0x6566,0xd4a0,0xea50,0x6a95,0x5adf,0x2b60,0x86e3,0x92ef,0xc8d7,0xc95f,
0xd4a0,0xd8a6,0xb55f,0x56a0,0xa5b4,0x25df,0x92d0,0xd2b2,0xa950,0xb557,
0x6ca0,0xb550,0x5355,0x4daf,0xa5b0,0x4573,0x52bf,0xa9a8,0xe950,0x6aa0,
0xaea6,0xab50,0x4b60,0xaae4,0xa570,0x5260,0xf263,0xd950,0x5b57,0x56a0,
0x96d0,0x4dd5,0x4ad0,0xa4d0,0xd4d4,0xd250,0xd558,0xb540,0xb6a0,0x95a6,
0x95bf,0x49b0,0xa974,0xa4b0,0xb27a,0x6a50,0x6d40,0xaf46,0xab60,0x9570,
0x4af5,0x4970,0x64b0,0x74a3,0xea50,0x6b58,0x5ac0,0xab60,0x96d5,0x92e0,
0xc960,0xd954,0xd4a0,0xda50,0x7552,0x56a0,0xabb7,0x25d0,0x92d0,0xcab5,
0xa950,0xb4a0,0xbaa4,0xad50,0x55d9,0x4ba0,0xa5b0,0x5176,0x52bf,0xa930,
0x7954,0x6aa0,0xad50,0x5b52,0x4b60,0xa6e6,0xa4e0,0xd260,0xea65,0xd530,
0x5aa0,0x76a3,0x96d0,0x4afb,0x4ad0,0xa4d0,0xd0b6,0xd25f,0xd520,0xdd45,
0xb5a0,0x56d0,0x55b2,0x49b0,0xa577,0xa4b0,0xaa50,0xb255,0x6d2f,0xada0,
0x4b63,0x937f,0x49f8,0x4970,0x64b0,0x68a6,0xea5f,0x6b20,0xa6c4,0xaaef,
0x92e0,0xd2e3,0xc960,0xd557,0xd4a0,0xda50,0x5d55,0x56a0,0xa6d0,0x55d4,
0x52d0,0xa9b8,0xa950,0xb4a0,0xb6a6,0xad50,0x55a0,0xaba4,0xa5b0,0x52b0,
0xb273,0x6930,0x7337,0x6aa0,0xad50,0x4b55,0x4b6f,0xa570,0x54e4,0xd260,
0xe968,0xd520,0xdaa0,0x6aa6,0x56df,0x4ae0,0xa9d4,0xa4d0,0xd150,0xf252,
0xd520);
I cannot very understand what is this.
Can vb do this? If can, how?
Thanks very much.
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the syntax is like this:
Dim ia() As Int16 = {0, 1, 2}
vb - does not like values like 0xc960 however...
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It's an array of integers:
Dim lunarInfo As Integer() = { &H4bd8, &H4ae0, &Ha570, &H54d5, &Hd260, &Hd950, &H5554, &H56af, &H9ad0, &H55d2, _
&H4ae0, &Ha5b6, &Ha4d0, &Hd250, &Hd295, &Hb54f, &Hd6a0, &Hada2, &H95b0, &H4977, _
.
.
.... }
Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007
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I must say thanks to both of you.
But, your answers look like different.
Which one is correct?
int16 or integer?
And VB really can use the code like "&H4bd8",Dave Kreskowiak?
Really thanks again.
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Int16 is a signed 16-bit integer. Integer is a signed 32-bit integer. The number you're looking at would all fit into 16-bit integers, but which type you use would depend on the math you're doing. I would assume that these numbers are used in other calculations which may involve floating poiint math, so using full processor-width numbers would probably make your app perform a bit better.
And yes, VB can understand &H4BD8. The "&H" just means that this constant is specified in hexadecimal format.
Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007
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I'm writing a text editor program, what I want to know is when attempting to print to a non-existent printer the program still sends the document to the print queue.
How do I tell the user that no printer is available and cancel the document from being sent to the printer queue?
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Anybloodyid wrote: when attempting to print to a non-existent printer
If the printer doesn't exist, you can't print to it. Are you asking if the printer object exists, but is unavailable??
Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007
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Why would you want to do this? I've paused print queues before so I could stack up jobs and go load different paper into a printer before they printed. Isn't this an option best left up to the user?
Ask yourself these questions first. Have you seen this kind of functionality in any other Windows app before? Why or why not?
Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007
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Hello,
Looking for everyone's opinion:
If my application references files/objects that aren't actually used in the app. does this "hurt" performance or is dotnet smart enough to realize that those aren't used so there is no performance hit.
Ex: I have a suite of controls that most of the time only 2 or 3 are used out of 10. I have a developer that referenced all 10 even though his app only used 2, then does the other 8 make an impact?
Thanks,
Nathan
-- modified at 14:12 Monday 2nd April, 2007
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nlarson11 wrote: If my application references files/objects that aren't actually used in the app. does this "hurt" performance
No. Only the stuff that gets used affects performance.
nlarson11 wrote: Ex: I have a suite of controls that most of the time only 2 or 3 are used out of 10. I have a developer that referenced all 10 even though his app only used 2, then does the other 8 make an impact?
No. Again, only the stuff that gets used affects performance. If you don't use a control in a library, it can't affect the apps performance. That is, unless the library is HUGE in size and it takes forever to load the assembly. But 10 controls in your library won't make any difference at all.
Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007
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Thanks Dave for replying...
Sorry for not being more clear...I guess that what I'm really getting at: the start up time...is it impacted by "dead" references?
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No since references that are never used don't make it into the final .EXE.
Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007
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great... thank you sir...
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is there any possible keyword in vb.net that can get me
out of the case loop under the select statement..
i want it to work exactly like c++
plz help
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I though this question looked familiar[^].
Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007
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man exit select select let us out of the select statement..
what if i m using 3 case loops inside n i want to exit those case loops
whenever the condition is not true, n jump on to the next case
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You don't have to do anything. There is no break in VB because it happens automatically.
If the first Case isn't true, Select automatically jumps to the next Case and tests it, and so on down the line until it find one that is True or it gets to Case Default.
Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007
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