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From what you have written it sounds like you are capturing the mouse down that triggers the drop down, but you did not show us how you are trying to go to the next row. From the result you are describing, I am guessing that you might be doing a SendKeys. If that is the case, you might instead try to do something like the following where 0 would be the column/cell number you want to set the focus to when you go to the next row...
if (DataGridView.Rows.Count > (DataGridView.CurrentRow.Index + 1))
DataGridView.CurrentCell = DataGridView.Rows[DataGridView.CurrentRow.Index + 1].Cells[0];
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hi Everyone
I Have drawn a Sine wave using GDI+ in C# windows application, now i need to know how to zoom the Selected region..
can anyone help me? plssssss
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an attempt:
I think there are 2 main things to do.
1. Determin the X1, X2 and Y1, Y2 where you want to zoom too. These are your constraints. (recalculate)
This means in the equation y = A sin (Bx - C) + D that both x and y have to be within the restraints.
2. scale your X-Y axis. if 100 pixels for Amplitude = 1 then you could set it to 200 pixels for amplitude = 1 (eg).
I would recommend doing one first without scaling, if the results are correct, you can rescale the axis to reflect the entire drawing area.
Hope this helps.
(it's been awhile, so double check  )
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I have to expand both Sine wave as well as with(in terms of pixels) of the bitmap.
can i have sample code..
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you just work out the sine function for every point along the way.
Christian Graus
Driven to the arms of OSX by Vista.
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skvs wrote: can i have sample code..
will be difficult as it has been a long time I have played with it...
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Sorry i ll explain my question clearly.
1) I have drawn a Sine Wave using Graphics.DrawCurve(..);
2) Now i need to capture (X1,Y1) and (X2, Y2) Vaues on mouse down and mouse Up function, where I'm selecting a particular region of the sinusoidal wave.
(may be upper half cycle).
3) So now i have the values, but i dont know how to enlarge only selected region in GDI+ C#..
plsssss help me.
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Your missing the point. You can't just specify that you want to zoom into an area on the form that you have already drawn, GDI doesn't support this. What you have to do, is clear the form, and redraw the area you want, but bigger.
You can capture x1,y1 x2,y2 mouse coordinates by handling the mouse down or mouse click events.
Now you have the values, clear the form. (by calling .Clear(); on your Graphics object, and redraw your sine wave, bigger, and just the bit within the mouse coordinates you found out.
E.g if your form is 1000 pixels wide and 1000 high, and you've drawn a sign wave from 0 to 360. If the user then picks to zoom in to 0,0 (top left corner) to 500,1000 (bottom in the middle). You need to then work out that 500 represents half way, which is 180 on your x axis. And that 1000 represents the whole distance (i.e. all the way from 1 to -1), you then clear the image, and redraw the sine wave from 0 to 180, but expanded to fill the whole form.
Basically, you need to store scale factors and position factors that you scale and move you sine wave by when redrawing it each time.
Simon
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That was what I was thinking, but you explained it better 
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that's a great idea, in fact it is required to draw only part of the sine wave, but how to find which are those points that i need to consider..
int intLenght = 200;<br />
PointF[] pf = new PointF[intLenght];<br />
<br />
for (int intI = 0; intI < intLenght; intI++)<br />
{<br />
int intHeightOffset = 250;<br />
if ((intI%10) > 5)<br />
{<br />
pf[intI] = new PointF(intHeightOffset + intI, (intI % 10) + intHeightOffset);<br />
}<br />
else<br />
{<br />
pf[intI] = new PointF(intHeightOffset + intI, -(intI % 10) + intHeightOffset);<br />
}<br />
}<br />
<br />
Graphics gps = this.CreateGraphics();<br />
gps.DrawCurve(new Pen(Color.DarkBlue), pf);<br />
if i select middle of the graph, from which point's of the array i hv to take to redraw the sine wave..?
pls dont mind, i need ur help..
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some one had deleted me message.
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I have this error "ExecuteReader: Connection property has not been initialized."
Here is my code . Could give me any advice to fix it ?Thanks
private void button1_Click(object sender, EventArgs e)
{
string cmd;
string field;
string parameter;
field = "Site,Model";
parameter = "@Site,@Model";
OleDbConnection aConnection = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\\db1.mdb");
cmd = "INSERT INTO Run(" + field + ") values (" + parameter + ")";
OleDbCommand sCommand = new OleDbCommand(cmd);
aConnection.Open();
OleDbDataReader aReader = sCommand.ExecuteReader();
sCommand.Parameters.Add("@Site", OleDbType.VarChar, 20);
sCommand.Parameters.Add("@Model", OleDbType.VarChar, 20);
sCommand.Parameters["@Site"].Value = "site1";
sCommand.Parameters["@Model"].Value = "Model1";
aReader.Close();
aConnection.Close();
}
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hung1984 wrote: OleDbConnection aConnection = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\\db1.mdb");
cmd = "INSERT INTO Run(" + field + ") values (" + parameter + ")";
OleDbCommand sCommand = new OleDbCommand(cmd);
aConnection.Open();
Look at the error message again and read through the code. How is the command object going to know which connection object to use if you didn't tell it.
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hung1984 wrote: OleDbConnection aConnection = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\\db1.mdb");
cmd = "INSERT INTO Run(" + field + ") values (" + parameter + ")";
OleDbCommand sCommand = new OleDbCommand(cmd);
add this
<br />
sCommand.Connection = aConnection;<br />
hope it helps
dhaim
ing ngarso sung tulodho, ing madyo mangun karso, tut wuri handayani. "Ki Hajar Dewantoro"
in the front line gave a lead, in the middle line build goodwill, in the behind give power support
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thanks, but i have another error?
"No value given for one or more required parameters."
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hung1984 wrote:
sCommand.Parameters.Add("@Site", OleDbType.VarChar, 20);
sCommand.Parameters.Add("@Model", OleDbType.VarChar, 20);
sCommand.Parameters["@Site"].Value = "site1";
sCommand.Parameters["@Model"].Value = "Model1";
try this :
sCommand.Parameters.Add("@Site", OleDbType.VarChar, 20).Value = "site1";
sCommand.Parameters.Add("@Model", OleDbType.VarChar, 20).Value = "Model1";
hope it helps
dhaim
ing ngarso sung tulodho, ing madyo mangun karso, tut wuri handayani. "Ki Hajar Dewantoro"
in the front line gave a lead, in the middle line build goodwill, in the behind give power support
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thanks , but same error occured?
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private void button1_Click(object sender, EventArgs e)
{
string cmd;
string field;
string parameter;
field = "Site,Model";
parameter = "@Site,@Model";
OleDbConnection aConnection = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\\db1.mdb");
cmd = "INSERT INTO Run(" + field + ") values (" + parameter + ")";
OleDbCommand sCommand = new OleDbCommand(cmd);
sCommand.Connection = aConnection;
aConnection.Open();
sCommand.Parameters.Add("@Site", OleDbType.VarChar, 20);
sCommand.Parameters.Add("@Model", OleDbType.VarChar, 20);
sCommand.Parameters["@Site"].Value = "site1";
sCommand.Parameters["@Model"].Value = "Model1";
OleDbDataReader aReader = sCommand.ExecuteReader();
sCommand.Parameters.Add("@Site", OleDbType.VarChar, 20);
sCommand.Parameters.Add("@Model", OleDbType.VarChar, 20);
sCommand.Parameters["@Site"].Value = "site1";
sCommand.Parameters["@Model"].Value = "Model1";
aReader.Close();
aConnection.Close();
}
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just wrong code line position  ,
thanks a lot 
dhaim
ing ngarso sung tulodho, ing madyo mangun karso, tut wuri handayani. "Ki Hajar Dewantoro"
in the front line gave a lead, in the middle line build goodwill, in the behind give power support
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hi to everyone.. anyone suggest me the method to read .mpp file content using C#. and also how we can store content to oracle database.
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Does the office toolkit give you the ability to bridge to project ? If not, then you need to find out the file format and work out how to read it.
Christian Graus
Driven to the arms of OSX by Vista.
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In .NET 2.0, assume that I have some SQL written along the lines of:
Select child.name, parent.name
From person child, person parent
On child.ParentId = parent.Id
Where child.category = 55
I now have to convert this SQL so that it selects from a cached DataTable of people instead of directly from the database.
Is there an elegant way to convert this SQL using DataTable.Select (or some other DataTable method)? (I realize that if there was just one Person in the SQL statement this would be simple.)
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If you've got relationships setup, you'll need to do something found at:
Select Statement Syntax[^]
Look for the section - "PARENT/CHILD RELATION REFERENCING"
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I repeatedly am running into the same problem. I do scientific work where we use images, video, and sound files to record events. The time of the creation of the file is very important to us as often a file shows what happened at one moment in time and the next file shows what happened maybe only several seconds later. Since image files, video files, and sound files are all tagged with the date/time of their creation we have a record of when the file was created allowing us to make many observations as we know when the event happened. These files are created by many types of devices cameras, audio recorders, camcorders, etc. The problem I have is that when these files are copied the creation date becomes the date of the copy and the original “real” creation date is lost. Understanding this and I have resorted to using a drive mirroring pieces of software to copy my files from devices so the the “real” creation date is preserved as the date of the copy is of no importance to me.
I am looking for ideas about how to go about writing a C# program to copy files and preserve the “real” creation date/time.
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Hi George,
I did tell you a couple of hours ago, modification datetime is the one to use.
In Windows creation time is when you create the container, not the contents;
modification time (or lastwrite time) is when you fill the container or in any way change the contents of the container.
So if you create a new document at 9 o'clock, edit it again at 10, and copy the file at 11 o'clock using Explorer, then the original will have created=9 modif=10, and the copy will have created=11 modif=10. So looking at modif time, they are the same; looking at creation time you would get confused indeed.
I set Windows Explorer to not show creation times and always show modification times.
So it will not confuse me, the datetime I see is about the content; I don't care about container times.
Of course, on top of the above, as you well know, some file types have a datetime information embedded in the data itself, such as the "picture taken" time inside a JPEG picture.
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