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I've tried multiple c# programs that I've found on the web, including this one from Code Project:
.NET Wrapper for ChangeDisplaySettingsEX[^]
I'm not sure why but I've never been able to successfully change my secondary display. NOt sure what I'm missing? Can someone provide any insight?
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Try sharing your code so we can see what you are missing?
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Message Removed
modified 14-May-19 11:59am.
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Message Removed
modified 14-May-19 11:59am.
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Message Removed
modified 14-May-19 11:59am.
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I have a list of strings and I want to join all of them as single line. Here spacings are the key, I Have to read the existing line and I need to maintain the same formatting. for example
Existing Lines:
BBSS14 CODE SIZE 253 1.25 1 800 EXTENDED 1.52 89.39
B4 CO S 3 1.1 5 80 EXTE 22 89.3669
BB14 CODEER SIZE 53 1 12 1147 EX 2.852 9
BB14 CODE SE 22253 0.1 1 1 EXTED 2.852 69
BB14 DOERERR SIZE 3 3 525 0 EXTEND 2.82 89.0
I have to read any one of the above lines and set the formatting.
If we see the above example some columns are left aligned and some are right aligned we have to maintain the same format for the given list of strings.
If somebody know the string formatting plz help me.
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We can't give you exact instructions because we have no idea how you are building yout strings, but if you want specifically formatted output, you have to specify that when you build the string.
There are a couple of ways to do that.
For string values, you can use PadLeft:
string abc = "ABC";
string abcdefgh = "ABCDEFGH";
Console.WriteLine(abc.PadLeft(8));
Console.WriteLine(abcdefgh.PadLeft(8));
Which will give you:
ABC
ABCDEFGHFor numbers, it's more complicated: Aligning strings within string.Format and interpolated strings[^]
Sent from my Amstrad PC 1640
Never throw anything away, Griff
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
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somewhat OT, but, I have always found this behavior of PadLeft weird: Quote: A new string that is equivalent to this instance, but right-aligned and padded on the left with as many spaces as needed to create a length of totalWidth. However, if totalWidth is less than the length of this instance, the method returns a reference to the existing instance. If totalWidth is equal to the length of this instance, the method returns a new string that is identical to this instance.
«Where is the Life we have lost in living? Where is the wisdom we have lost in knowledge? Where is the knowledge we have lost in information?» T. S. Elliot
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You do have to wonder what the SQL Server designers were smoking when they came up with that, yes ... 
Sent from my Amstrad PC 1640
Never throw anything away, Griff
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
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anilkolla wrote: If we see the above example some columns are left aligned and some are right aligned we have to maintain the same format for the given list of strings.
That's not random on a column. Text is aligned different from numbers. All you need to do to set the correct alignment is determine whether it is a text or a number.
Bastard Programmer from Hell 
If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.
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I assume that the source of the data example shown is some form of structured tabular data. The misalignment in your example is proof of the difficulties involved.
Think about the issues in producing strings whose formats match/mirror the tabular data:
1. font: mono-spaced (simpler) vs. variable width (much more complex)
2. the variation in the length of entries for fields: you will have to do some form of analysis of all the data to figure our for each field the maximum space required.
What is your final goal here ? Print, or screen ? If screen, why not use a UI element designed for tabular data ?
Definitely review the content here to find some possibly useful code tools and resources: [^]. And, note that C# 6 has some new string interpolation features:[^]
«Where is the Life we have lost in living? Where is the wisdom we have lost in knowledge? Where is the knowledge we have lost in information?» T. S. Elliot
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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.OleDb;
namespace WindowsFormsApplication5
{
public partial class Form1 : Form
{
OleDbConnection cn = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\hesham\Desktop\Database2.accdb");
OleDbDataAdapter da;
DataTable dt = new DataTable();
OleDbCommand cmnd;
public Form1()
{
InitializeComponent();
filldatagridview();
}
void filldatagridview()
{
dt.Clear();
da = new OleDbDataAdapter("Select * From Table1 ", cn);
da.Fill(dt);
dataGridView1.DataSource = dt;
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
cmnd = new OleDbCommand("insert into Table1 values('" + textBox4.Text + "','" + textBox3.Text + "'," + Convert.ToInt32(textBox1.Text) + ",'" + textBox2.Text + "')", cn);
cn.Open();
cmnd.ExecuteNonQuery();
cn.Close();
filldatagridview();
MessageBox.Show("added success ", "add", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
private void dataGridView1_DoubleClick(object sender, EventArgs e)
{
textBox4.Text = this.dataGridView1.CurrentRow.Cells[0].Value.ToString();
textBox3.Text = this.dataGridView1.CurrentRow.Cells[1].Value.ToString();
textBox1.Text = this.dataGridView1.CurrentRow.Cells[2].Value.ToString();
textBox2.Text = this.dataGridView1.CurrentRow.Cells[3].Value.ToString();
}
private void button2_Click(object sender, EventArgs e)
{
cmnd = new OleDbCommand("Update Table1 Set name ='" + textBox3.Text + "',age = '" + Convert.ToInt32(textBox1.Text) + "', address='" + textBox2.Text + "'Where id='" + textBox4.Text + "", cn);
cn.Open();
cmnd.ExecuteNonQuery();
cn.Close();
filldatagridview();
MessageBox.Show("edit success ", "edit", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
private void button3_Click(object sender, EventArgs e)
{
cmnd = new OleDbCommand("Delete From Table1 Where id='" + textBox4.Text + "", cn);
cn.Open();
cmnd.ExecuteNonQuery();
cn.Close();
filldatagridview();
MessageBox.Show("delete success ", "delete", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
private void button4_Click(object sender, EventArgs e)
{
Close();
}
}
}
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OK, now you're going to have to explain what you mean by "it doesn't work". That's not a valid problem description.
What DOES happen? What error messages do you get?
In a quick glance, how you're building your SQL INSERT statement is horrible and prone to many problems and even destruction of your entire database. Google for "SQL Injection Attack" for why it's so bad, and then Google for "C# SQL Parameterized queries" for discussions and examples of how to do it correctly.
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Hi,
I'm guessing here, I think your filldatagridview() method only works well once; when you execute it again, it assigns the same DataTable object (possibly with a different content, but that is irrelevant here) as the DataSource to your DGV, hence the DGV doesn't know something should change.
Try adding
dataGridView1.DataSource = null;
before setting
dataGridView1.DataSource = dt;
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Member 14366610 wrote: '" + textBox4.Text + ""
Quotes don't match. Learn about parameterized queries.
Also, don't keep connections open outside their method. Also, there's a factory-method on the connection to create commands. They're all disposables, so they should all be in a using-clause.
Start over.
Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.
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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.OleDb;
namespace WindowsFormsApplication5
{
public partial class Form1 : Form
{
OleDbConnection cn = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\hesham\Desktop\Database2.accdb");
OleDbDataAdapter da;
DataTable dt = new DataTable();
OleDbCommand cmnd;
public Form1()
{
InitializeComponent();
filldatagridview();
}
void filldatagridview()
{
dt.Clear();
da = new OleDbDataAdapter("Select * From Table1 ", cn);
da.Fill(dt);
dataGridView1.DataSource = dt;
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
cmnd = new OleDbCommand("insert into Table1 values('" + textBox4.Text + "','" + textBox3.Text + "'," + Convert.ToInt32(textBox1.Text) + ",'" + textBox2.Text + "')", cn);
cn.Open();
cmnd.ExecuteNonQuery();
cn.Close();
filldatagridview();
MessageBox.Show("added success ", "add", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
private void dataGridView1_DoubleClick(object sender, EventArgs e)
{
textBox4.Text = this.dataGridView1.CurrentRow.Cells[0].Value.ToString();
textBox3.Text = this.dataGridView1.CurrentRow.Cells[1].Value.ToString();
textBox1.Text = this.dataGridView1.CurrentRow.Cells[2].Value.ToString();
textBox2.Text = this.dataGridView1.CurrentRow.Cells[3].Value.ToString();
}
private void button2_Click(object sender, EventArgs e)
{
cmnd = new OleDbCommand("Update Table1 Set name ='" + textBox3.Text + "',age = '" + Convert.ToInt32(textBox1.Text) + "', address='" + textBox2.Text + "'Where id='" + textBox4.Text + "", cn);
cn.Open();
cmnd.ExecuteNonQuery();
cn.Close();
filldatagridview();
MessageBox.Show("edit success ", "edit", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
private void button3_Click(object sender, EventArgs e)
{
cmnd = new OleDbCommand("Delete From Table1 Where id='" + textBox4.Text + "", cn);
cn.Open();
cmnd.ExecuteNonQuery();
cn.Close();
filldatagridview();
MessageBox.Show("delete success ", "delete", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
private void button4_Click(object sender, EventArgs e)
{
Close();
}
}
}
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Could some .... what?
You haven't asked a question or described a problem. Just posting a code dump doesn't do that.
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Hello Gentlemen,
Could somebody give a good advise for the following :
I am an aspirant in learning c# and I wish to make a GUI that can read canbus J1939 engine data to read RPM .
I could read the can-bus data by tapping to the vessels engine can bus using a can to USB converter called kvaserCAN. I do understand the PGN data frames for the bytes 4 and 5 need to mathematically applied to find the product with .125 rpm / bit to get the right rpm. (byte 4 being the least )
basically how can we tap the can info on the USB port that does not fall on the usual com port but on the kvaser com port as we see it using the device manager.
appreciate if a sample code be shared to start bit by bit programming to be used on a C# .
Sincerely
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Here[^] seem to be a load of examples.
noop()
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Hi Phil , could not find the proper answer to the query ,,,,thanks anyways
kind regards
FIROZ 
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I need to do simulated annealing for facility planing with c# codes .. Im tryig but I couldnt
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... and? You never asked a question or described any kind of problem, so it's pretty much impossible top guess what you're looking for.
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It's time for you to get to work: now !
What research have you done on simulated annealing ? What algorithms have you implemented in what languages ?
You show us code; you ask specific questions about the code; you include error messages, and analysis of what you think is happening.
Then ... we help you.
«Where is the Life we have lost in living? Where is the wisdom we have lost in knowledge? Where is the knowledge we have lost in information?» T. S. Elliot
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I'm sure it is important - to you - but it's equally important that what you submit as your final project is your own work, not ours.
So if you have a problem, we'll help - but you have to show us what you have done. We are more than willing to help those that are stuck: but that doesn't mean that we are here to do it all for you! We can't do all the work, it's part of your grades and it wouldn't be at all fair for us to do it all for you.
So we need you to do the work, and we will help you when you get stuck. That doesn't mean we will give you a step by step solution you can hand in!
Start by explaining where you are at the moment, and what the next step in the process is. Then tell us what you have tried to get that next step working, and what happened when you did.
Sent from my Amstrad PC 1640
Never throw anything away, Griff
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
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