Re: Differance Between Protected and protected internal - C# Discussion Boards

Re: Differance Between Protected and protected internal

24-Jun-07 23:54

Hello Friends,

I want to know what is difference between protected and protected internal.

i know that protected means access limited to type and types derived from it.

and protected internal means access limited to type and types derived from it

or in the assembly.

Do protected is subset of protected internal. And do protected is required when

we specify internal as access specifier.

please give example that will be helpfull..

Thanks in advance.

rahul kulkarni

Colin Angus Mackay25-Jun-07 0:00

Re: Differance Between Protected and protected internal

25-Jun-07 0:00

Rahul.RK wrote:
I want to know what is difference between protected and protected internal.

According to the documentation[^] the answer is:

protected = Access is limited to the containing class or types derived from the containing class
protected internal = Access is limited to the current assembly or types derived from the containing class

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Rahul.RK25-Jun-07 0:05

Re: Differance Between Protected and protected internal

25-Jun-07 0:05

hello Thanks for reply...

i got the concept according to definition.

But as internal gives access to all the assembly then

what is use of protected?

Thats my question..

Rahul Kulkarni

Colin Angus Mackay25-Jun-07 0:09

Re: Differance Between Protected and protected internal

25-Jun-07 0:09

Rahul.RK wrote:
But as internal gives access to all the assembly then what is use of protected?

So you can derive a class from it from outside the assembly.

Rahul.RK25-Jun-07 0:18

Re: Differance Between Protected and protected internal

25-Jun-07 0:18

Thanks alot....

Will you please give me any helpfull site of book name

which will give me idea of all this basic fundamentals of C#.Net

Rahul Kulkarni

Colin Angus Mackay25-Jun-07 0:23

Re: Differance Between Protected and protected internal

25-Jun-07 0:23

There are lots of beginner books. It really depends on your style of learning. Go to the book store and browse through a few books. Pick the one that appeals to you most.

Rahul.RK25-Jun-07 0:25

25-Jun-07 0:25

Thanks for help.

Rahul Kulkarni

DBNull.Value problem

t4ure4n24-Jun-07 23:46

24-Jun-07 23:46

Hello i am facing a slight problem with Store a record in the database.

I have a column of Type Decimal (It can have null values in the DB).
i take the input in a textbox and saves it to the database.

dataRow["SPEED"] = (this.tbSpeed.Text == "" ? DBNull.Value.ToString() : this.tbSpeed.Text);

If I leave it blank it gives me following error

An unhandled exception of type 'System.ArgumentException' occurred in System.Data.dll

Additional information: Input string was not in a correct format.Couldn't store <> in SPEED Column. Expected type is Decimal

What could be the solution to this problem

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Colin Angus Mackay24-Jun-07 23:55

24-Jun-07 23:55

t4urean wrote:
DBNull.Value.ToString()

Why are you suppling a ToString() on DBNull.Value? Don't do that just pass DBNull.Value

t4ure4n24-Jun-07 23:57

24-Jun-07 23:57

If I don't use DbNull.value.tostring() then i get the following error

Type of conditional expression cannot be determined because there is no implicit conversion between 'System.DBNull' and 'string'

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Colin Angus Mackay25-Jun-07 0:03

25-Jun-07 0:03

I suspect that is because of the trinary operator that you are using. These are generally considered to be bad practice.

Try this:

if (this.tbSpeed.Text == "")
     dataRow["SPEED"] = DBNull.Value;
else
     dataRow["SPEED"]  = this.tbSpeed.Text;

Colin Angus Mackay25-Jun-07 0:04

25-Jun-07 0:04

And I'd guess that that the contents of the text box will need to be converted to a decimal also.

martin_hughes25-Jun-07 1:07

martin_hughes

25-Jun-07 1:07

Try this:

dataRow["Speed"] = this.tbSpeed.Text ?? (object) DBNull.Value;

blackjack215025-Jun-07 0:20

blackjack2150

25-Jun-07 0:20

IF you would use a simple "IF", it would be very simple.

t4ure4n25-Jun-07 0:25

25-Jun-07 0:25

I have used this even then i am getting the same error

if (this.tbSpeed.Text == "")
dataRow["SPEED"] = DBNull.Value;//"NULL";
else
dataRow["SPEED"] = this.tbSpeed.Text;

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blackjack215025-Jun-07 0:51

blackjack2150

25-Jun-07 0:51

Your manner of storing values in the database seems pretty unusual. I would create a command with an "INSERT" statement as the command text and call it's ExecuteNonQuery() method. For the decimal column I would use an SQL Parameter of decimal type to avoid format errors.

t4ure4n25-Jun-07 0:56

dividing a windows forms in two

25-Jun-07 0:56

I have found the solution... Just applied the validation when creating the query string and it works fine to specify NUll for an empty string.

I am doing in the same way you are saying
but i have a seperate class that deals with it when provided with a data row.

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justintimberlake24-Jun-07 23:40

justintimberlake

24-Jun-07 23:40

how can i divide a windows forms in two half horizontally. The upper half contains one listview control and the lower half contains another list view control. and how can i manage the size when the form is expanded making sure that two list view doest overlap each other(i.e when form is expanded);

Colin Angus Mackay24-Jun-07 23:45

24-Jun-07 23:45

You can use a split container. It's in the toolbox. It creates two panels that you can put your controls into with a resizable divider. It ensures that the controls don't overlap. You can set it to be horizonal or vertical.

justintimberlake24-Jun-07 23:54

justintimberlake

24-Jun-07 23:54

is it availabe in dotnet 2003 or frame work 1.1

Colin Angus Mackay24-Jun-07 23:57

24-Jun-07 23:57

justintimberlake wrote:
is it availabe in dotnet 2003 or frame work 1.1

According to MSDN[^] the answer is no.