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Yes sorry you have a point it has a public static void Main sorry my mistake . This is a normal windows forms application C#. now the thing is i can pass strings to the main method but i need to pass a reference to an instance of something. is that possible?
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You can't pas a reference between processes. The reference will not valid in the process you're passing it to.
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I am using VS 2005 and i have to read some images in the form of byte arrays and get those arrays in another form where i have to use these values and save them to database in Sql server. But the problem is that i am not able to read byte arrays from one form to another form. Please help. Any help would be appreciated.
Thanks
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Hi,
what do you mean by "not able to read byte arrays from one form to another form"? Couldn't you just pass the byte-array within the constructor, a method, session-object etc.?
Regards
Sebastian
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There are two different approaches fo passing data between objects depending on the relationship.
If the sending form instanciates the receiving form, then the receiving form should have a public property or method that is used to receive the data.
If the sending form was instanciated by the receiveng form then it should raise an event along with a custom event args instance (a class derived from System.EventArgs that holds the data to be passed).
If the forms are not so closely related, then a combination of these methods is often the best solution so the property/method or event is propogated up/down the class hierachy. If this gets too cumbersome, a separate 'manager' type class that is responsible for sending and receiving data between the objects it manages can also be a good solution.
DaveBTW, in software, hope and pray is not a viable strategy. (Luc Pattyn) Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia) Why are you using VB6? Do you hate yourself? (Christian Graus)
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Good answer
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I want to retrive data from SQL database using C#.
and i want to put that data in DropDownList.
How can i do this?????
Please Help me.
Thanks In advance.......!!
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and I want to put that data in DropDownlist without using data source
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I think this can help u
u can use SqlDataAdapter and DataSet classes
SqlDataAdapter dd = new SqlDataAdapter();
DataSet de = new DataSet();
dd = new SqlDataAdapter("SELECT EmpName,isWaiter,isCashier FROM Employees", con);
de.Clear();
try
{
con.Open();
dd.Fill(de);
int k;
for (k = 0; k < de.Tables[0].Rows.Count; k++)
{
comboBox2.Items.Add(de.Tables[0].Rows[k].ItemArray[0].ToString());
}
}
catch(Exception ex)
{
MessageBox.Show(ex.Message.ToString());
}
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using System.Data;
using System.Data.SqlClient;
Class test
{
public void pageload()
{
SqlConnection conn = new SqlConnection(@"User id:sa; Password:password; Initial catalog: databaseName; data source:localhost");
conn.Open();
SqlCommand cmd = conn.CreateCommand();
cmd.CommandText = "SELECT bob FROM table";
SqlDataReader reader = cmd.ExecuteReader();
while (reader.Read())
{
dropdownlist.Items.Add(reader["bob"].ToString());
}
reader.Close();
conn.Close();
}
}
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dear friends,
i am using WMI code to get print job details. i am not able to get number of copies which the user enterd for printing.
is there any way to get number of copies user entered. could any one help me. using c# or c++
thanks in advance
Nishar A.
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Not reliably. The number of copies is no part of the job. An applicaiton has two choices when printing multiple copies. Either it can tell the driver to render the copies, in which case, the driver has a choice, whether to render the copies itself, or have the printer do it, or the application can render each copy itself, where the driver will never know there is multiple copies of the same page being generated.
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Hi
i am basically new to C# ? and all this might be simple for you ppl ...
i wanna know how i can access or call a function of a form (say A ) from a Form (say B) .
I wanna create an application that has multiple forms in it .
Ur help will be highly appreciated
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delegate is the way to go. FormB should expose a delegate on which FormA can subscribe to get notifications. Alternate way is to make the method public and pass first form's object to second form through constructor.
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Hey budy ........... I used static Public variables then I used the NameofTheForm.Var_Name if I want to acces only variables . Does this work for functions
Thank you
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That really is a bad idea for a number of reasons:
1) Consider the case when you have two forms open - which one can "load" the static variable? How would the accessor know which had loaded it?
2) Exposing variables directly as public fixes the design of your class - because something may use the public variable, you cannot change how your class works without reflecting that in the public variable. If you expose this as a property, you can.
3) Accessing a different forms data is a bad idea from the start, as it fixes the design of one form to teh design of another. This means it is much harder to reuse classes, and thus does nothing to improve reliablity.
No trees were harmed in the sending of this message; however, a significant number of electrons were slightly inconvenienced.
This message is made of fully recyclable Zeros and Ones
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public static works, but is almost always the wrong way to do it. If any property or method is delaing with or getting data from an instance of the class it resides in, it should not be static. In these cases, you need an instance of the form to access its properties/methods. If you don't have an instance, then delegates/events are the way to go.
DaveBTW, in software, hope and pray is not a viable strategy. (Luc Pattyn) Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia) Why are you using VB6? Do you hate yourself? (Christian Graus)
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I have been researching my issue with the reports. I have no idea what I am doing wrong. If someone is availiable to help me contact me on skype. My Skype Name is JollyMansArt.
I have been researching the development of reports both Crystal and Microsoft Report Viewer. I can not get the application to give me a report when I pass it information via a dataset, Only when I give the report the connection method directly. The problem with that is the database will be on different servers and different databases. So the report must pull it's data from the connection string.
With the crystal reports I go and create my report template positioning the fields, then I populate the dataset. But the report is always blank. The same goes for MS Report Viewer.
Why...
private void ReportSetup1()
{
SqlConnection conReport = new SqlConnection(WhatIsMyConnectionString);
SqlCommand cmdReport = new SqlCommand();
SqlDataReader drReport;
DataSet dsReport = new AppLoaderDataSet1();
try
{
conReport.Open();
cmdReport.CommandType = CommandType.Text;
cmdReport.Connection = conReport;
cmdReport.CommandText = "Select Domain, FullName, MachineName, WindowsUserName, ApplicationName, WorkstationVersion, ServerVersion from vw_Users_vs_Server_Versions_Match";
drReport = cmdReport.ExecuteReader();
dsReport.Tables[0].Load(drReport);
drReport.Close();
conReport.Close();
conReport.Open();
cmdReport.CommandType = CommandType.Text;
cmdReport.Connection = conReport;
cmdReport.CommandText = "Select Domain, FullName, MachineName, WindowsUserName, ApplicationName, WorkstationVersion, ServerVersion from vw_Users_vs_Server_Versions_NoMatch";
drReport = cmdReport.ExecuteReader();
dsReport.Tables[1].Load(drReport);
drReport.Close();
conReport.Close();
ADMCReportViewer.LocalReport.ReportEmbeddedResource = "PeerAssistLoader.UsersWithInvalidApplicationVersion.rdlc";
ReportDataSource rds = new ReportDataSource();
rds.Name = "AppLoaderDataSet1_vwUsersvsServerVersionsMatch";
rds.Value = dsReport.Tables[1];
ADMCReportViewer.LocalReport.DataSources.Add(rds);
ADMCReportViewer.RefreshReport();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
finally
{
if (conReport.State == ConnectionState.Open)
{
conReport.Close();
}
}
}
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Hi everyOne.
I have a DataGridView with a checkBoxCell(Column).I have 30 or...Rows in my dataGridView and i check 20 rows. I want to know how many rows is checked.
And how many is Not.
Thank u.
CanI
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According to my calculations you have 20 checked, which leaves 10 unchecked.
Hope this helps!
Henry Minute
Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”
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