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Off course I forgot to mention that I already used any kind of possible Exception for the Process.Start method. The application I am developing is a CONSOLE application launching a WIN32 application, in detail I am launching DEVENV i.e. the Visual Studio at command line.
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Hi
I'm getting this error while trying to abort threads:
"Object Reference Not set to an instance of an object"
The code is:
<br />
try<br />
{<br />
Client_Login clog = new Client_Login();<br />
clog.clnt_th.Abort();<br />
clog.sock.Close();<br />
thvideo.Abort();
}<br />
catch(System.NullReferenceException expnul)<br />
{<br />
MessageBox.Show(expnul.Message);<br />
}<br />
plz help me out that How I abort my open threads as in above code some connection and threads are made in another class whereas the disconnect function is in main class.
Shanzay
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Gareth,
clog is the object to access the control of thread which is use in other class and if I comment-out the clog aborting line then error on the thvideo.abort().Means error just come on abort() whatever thread I'm aborting.Got it?
Shanzay
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Hello...
I have a problem. I try to show all property
in my object into a propertyGrid.
My class is something like this :
class MyClass
{
public Parent parent = new Parent();
}
class Parent
{
public Child child = new Child();
}
class Child
{
public string text = "Hello Child";
}
If I create a new instance from MyClass and
put it in property grid, I can only see a gray
text from "Parent". But I cannot go into it,
to see the "Child". There are no "+" sign.
How to make "Child" also editable in property grid ?
Thanks...
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in order to work with that control, you need to define some properties within your class(es), don't you think?
SkyWalker
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class MyClass
{
private Parent parent = new Parent();
public Parent ParentInstance
{
get { return parent; }
set { parent = value; }
}
}
class Parent
{
private Child child = new Child();
public Child ChildInstance
{
get { return child; }
set { child = value; }
}
}
class Child
{
private string text = "Hello Child";
public string Text
{
get { return text; }
set { text = value; }
}
}
I change the member variable into properties.
It doesn't work also.
Probably there are some attribute to make the
properties in child class visible...?
I can only see "ParentInstance" gray and not editable
or clickable....
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of course you must use attributes.
Have a look here[^] first, then do what you have to do, after you undestand what you are doing 
SkyWalker
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Hi,
You must explicitely tell the PropertyGrid to show subproperties. To do that, the easiest way is to assign the ExpandableObjectConverter to your Parent and Child classes, like this:
[TypeConverter(typeof(ExpandableObjectConverter ))]
class Parent
{
private Child child = new Child();
public Child ChildInstance
{
get { return child; }
set { child = value; }
}
}
[TypeConverter(typeof(ExpandableObjectConverter ))]
class Child
{
private string text = "Hello Child";
public string Text
{
get { return text; }
set { text = value; }
}
}
Best regards,
Nicolas Cadilhac @ VisualHint
Smart PropertyGrid.Net
Microsoft PropertyGrid Resource List
Free PropertyGrid for MFC
Smart FieldPackEditor.Net / DateTimePicker
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Hi All,
I have fetched the list of Tables and columns using the following code.
dtTabls = con.GetOleDbSchemaTable(OleDbSchemaGuid.Tables,tables);
foreach (DataRow row in dtTabls.Rows)
{
node n = new node();
object[] columns = new object[] { null, null, row["TABLE_NAME"].ToString (), null }; n.table=row["TABLE_NAME"].ToString ();
dtCol = con.GetOleDbSchemaTable(OleDbSchemaGuid .Columns ,columns );
ArrayList column = new ArrayList(); foreach (DataRow row1 in dtCol.Rows )
{
column.Add(row1["COLUMN_NAME"]).ToString();
}
n.columns = column; DataBaseSchema.Add(n); named "tableNames".
}
now i want to retrieve the columns datatypes.
Quick response will be highly appritiated and Thanx in advance
Regards,
chanzeb chaudhary
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chanzeb,
Below returns you a column collection:
dtTabls.Columns
So, to get the column DataType:
dtTabls.Columns[i].DataType
Once you have the Type, if you want to check what it is, you'll need to do a typeof(Type), eg: typeof(Int32)
Regards,
Gareth.
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Hi everybody!
I have a DataGridView which has a column of type double. When the user types something bad(not a number) i want to set back the cell value on the previous value of the cell(the value which was before the user edited the cell) or just set a default value.
I try to parse the value in the CellValidating event and if the parse fails then i set a default value but it doesn't works. I think because the cell still remains in editing mode.
private void dataGridView1_CellValidating(object sender, DataGridViewCellValidatingEventArgs e)
{
double newDouble;
if (e.ColumnIndex == 5)
{
if (!double.TryParse(e.FormattedValue.ToString(), out newDouble))
{
MessageBox.Show("Error parsing the data!");
dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value = 0.0;
}
}
}
How can i correct this?
Thanks!
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you have e.ColumnIndex and e.RowIndex, so access the cell directly through them
SkyWalker
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Hi!
I did this. You can see it on the code which i posted in the question but it does't work.
Anything else?
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I have this code but I need to convert to an array. So this sum program should be in array.
Could someone help me out.
static void Main(string[] args)
{
string firstNumber, // first string entered by user
secondNumber,
thirdNumber;
// second string entered by user
int number1, // first number to add
number2,// second number to add
number3,//third number to add
sum; // sum of number1, number2, and number3
// prompt for and read first number from user as string
Console.Write( "Please enter the first integer: " );
firstNumber = Console.ReadLine();
// read second number from user as string
Console.Write( "\nPlease enter the second integer: " );
secondNumber = Console.ReadLine();
Console.Write("\nPlease enter the third integer: ");
thirdNumber = Console.ReadLine();
// convert numbers from type string to type int. Note: "int" would have worked as well.
number1 = Int32.Parse( firstNumber );
number2 = Int32.Parse( secondNumber );
number3 = Int32.Parse( thirdNumber );
// add numbers
sum = number1 + number2 + number3;
// display results
Console.WriteLine("\nThe sum is {0}.", sum);
}
}
}
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Here we go, changed it all to work with arrays.
<br />
static void Main(string[] args)<br />
{<br />
int[] Numbers = new int[3];<br />
int[] sum = new int[1];<br />
<br />
Console.Write("Please enter the first integer: ");<br />
Numbers[0] = Convert.ToInt16(Console.ReadLine());<br />
<br />
Console.Write("\nPlease enter the second integer: ");<br />
Numbers[1] = Convert.ToInt16(Console.ReadLine());<br />
<br />
Console.Write("\nPlease enter the third integer: ");<br />
Numbers[2] = Convert.ToInt16(Console.ReadLine());<br />
<br />
for (int i = 0; i < Numbers.Length; i++)<br />
sum[0] += Numbers[i];<br />
<br />
Console.WriteLine("\nThe sum is {0}.", sum[0]);<br />
<br />
Console.ReadKey();<br />
}<br />
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ProdigiSA,
You just did someones homework for them 
Regards,
Gareth.
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Wewps 
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How do you find an average of three numbers .
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I'm only in 8th grade and I'm learning C# by myself. So shut up if you do not know.
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Better u can use arraylist and solve this issue.
otherwise u can define the int array and size.
Continue...
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Pfft... recursion is the way to go here. All classroom assignments require recursion.
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Hi,
This is my interface
DataTable FindAll();<br />
implementation is
<br />
public DataTable FindAll()<br />
{ String query = "SELECT * FROM Media";<br />
DataTable dt = util.DatabaseManager.ExecuteQuery(ConnectionString, query, "outdoordata");<br />
if (dt.Rows.Count == 0)<br />
{<br />
return null;<br />
}<br />
return new media(dt.rows[0]);------it is showing error "cannot implicitly convert media to system.data.datatable.<br />
}<br /> Here is media is class which done the following
<br />
public class media<br />
{<br />
public Media(DataRow dr)<br />
{<br />
if (dr["media_type_id"] != DBNull.Value)<br />
{<br />
this.media_type_id = Int32.Parse(dr["media_type_id"].ToString());<br />
}<br />
if (dr["description"] != DBNull.Value)<br />
{<br />
this.description = dr["description"].ToString();<br />
}<br />
if (dr["width"] != DBNull.Value)<br />
{<br />
this.width = Double.Parse(dr["width"].ToString());<br />
}<br />
<br />
}<br />It is giving error is "cannot implicitly convert media to system.data.datable
murali krishna
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