Develop Reference

How to disable more than one NumericUpDown controls using one method?

i have a form with more than one NumericUpDown as controls to input answer. i want every input is true for an operation (multiplication, sum etc), NumericUpDown for that operation will be disable. i have used the code below (just for sum operation), but i think its not efficient because i have to make a method to check every operation.
private void IsSumTrue() {
if (add1 + add2 == sum.Value)
{
sum.Enabled = false;
}
}
private void IsDifferenceTrue()
{
if (add1 - add2 == difference.Value)
{
difference.Enabled = false;
}
}
private void IsProductTrue()
{
if (add1 * add2 == product.Value)
{
product.Enabled = false;
}
}
private void IsQuotientTrue()
{
if (add1 / add2 == quotient.Value)
{
quotient.Enabled = false;
}
}
anyone have idea how to make it more efficient with just a method for all operation?
below is my idea, but to check the value is true for every NumericUpDown i don't know how.
private void DisableIfValueIsTrue()
{
foreach(Control control in this.Controls)
{
NumericUpDown value = control as NumericUpDown;
// if(value [NEED HELP]
}
}

Considering your situtaion, you can set a tag for each NumericUpDown in design mode like this:
sum.Tag=1;
square.Tag=2;
etc
Then define some int variables:
int iSum=add1+add2;
int iSquare= //Whatever you want
etc
And finally loop through your controls this way:
foreach (NumericUpDown control in this.Controls.OfType<NumericUpDown>())
{
int intCondition = Convert.ToInt32(control.Tag) == 1
? iSum
: Convert.ToInt32(control.Tag) == 2
? iSquare
: Convert.ToInt32(control.Tag) == 3
? i3
: i4; //You should extend this for your 8 controls
control.Enabled = intCondition == control.Value;
}
OK! Second way I offer
Since you will have to always check 8 different conditions, you could simply forget about looping through the controls and just change your method like this:
private void DisableIfValueIsTrue()
{
sum.Enabled = add1 + add2 != sum.Value;
difference.Enabled= add1 - add2 != difference.Value;
product.Enabled= add1 * add2 != product.Value;
quotient.Enabled= (add2 !=0) && (add1 / add2 != quotient.Value);
//etc
}

I came across this while doing some research and would like to give my solution I used for my situation and hope it helps people. I needed minimum and maximum numbers for a calculation, so mine are named appropriately and I correlated these with some CheckBoxes. I used null in beginning of minimum and end of maximum to account for empty. I also had to create an event handler SubscribeToEvents() shown below.
In my load event for my form:
SubscribeToEvents();
_checkBoxs = new[] { cbXLight, cbLight, cbMedium, cbHeavy, cbXHeavy, cbXXHeavy, cbXXXHeavy };
_minimumsNumericUpDowns = new[] { null, nLightMin, nMediumMin, nHeavyMin, nXHeavyMin, nXXHeavyMin, nXXXHeavyMin };
_maximumsNumericUpDowns = new[] { nXLightMax, nLightMax, nMediumMax, nHeavyMax, nXHeavyMax, nXXHeavyMax, null };
then I created a method:
private void DisableNumericUpDowns()
{
// disable everything:
foreach (var n in _minimumsNumericUpDowns)
{
if (n != null)
n.Enabled = false;
}
foreach (var n in _maximumsNumericUpDowns)
{
if (n != null)
n.Enabled = false;
}
}
The event handler:
private bool _eventsSubscribed;
private void SubscribeToEvents()
{
if (_eventsSubscribed)
return;
_eventsSubscribed = true;
cbXXHeavy.CheckedChanged += CheckBox_NumericState;
cbXHeavy.CheckedChanged += CheckBox_NumericState;
cbXLight.CheckedChanged += CheckBox_NumericState;
cbHeavy.CheckedChanged += CheckBox_NumericState;
cbLight.CheckedChanged += CheckBox_NumericState;
cbMedium.CheckedChanged += CheckBox_NumericState;
cbXXXHeavy.CheckedChanged += CheckBox_NumericState;
}
Now I can used this to check when they are enabled and if they are greater than or less than 0 if needed in the method CheckBox:
private void CheckBox_NumericState(object sender, EventArgs e)
{
// disable everything
DisableNumericUpDowns();
// see if more than one checkbox is checked:
var numChecked = _checkBoxs.Count((cb) => cb.Checked);
// enable things if more than one item is checked:
if (numChecked <= 1) return;
// find the smallest and enable its max:
var smallest = -1;
for (var i = 0; i < _checkBoxs.Length; i++)
{
if (!_checkBoxs[i].Checked) continue;
if (_maximumsNumericUpDowns[i] != null)
{
_maximumsNumericUpDowns[i].Enabled = true;
}
smallest = i;
break;
}
// find the largest and enable its min:
var largest = -1;
for (var i = _checkBoxs.Length - 1; i >= 0; i--)
{
if (!_checkBoxs[i].Checked) continue;
if (_minimumsNumericUpDowns[i] != null)
{
_minimumsNumericUpDowns[i].Enabled = true;
}
largest = i;
break;
}
// enable both for everything between smallest and largest:
var tempVar = largest - 1;
for (var i = (smallest + 1); i <= tempVar; i++)
{
if (!_checkBoxs[i].Checked) continue;
if (_minimumsNumericUpDowns[i] != null)
{
_minimumsNumericUpDowns[i].Enabled = true;
}
if (_maximumsNumericUpDowns[i] != null)
{
_maximumsNumericUpDowns[i].Enabled = true;
}
}
}
So I can check each state as required:
I want to check if Extra Light is check:
// Extra Light
if (!cbXLight.Checked) return;
if (nXLightMax.Enabled == false)
{
_structCategoryType = XLight;
CheckStructureSheets();
}
else
{
if (nXLightMax.Value > 0)
{
_dMax = nXLightMax.Value;
_structCategoryType = XLight;
CheckStructureSheets();
}
else
{
MessageBox.Show(#"Extra Light Max cannot be zero (0)");
}
}
and next light checks both:
// Light
if (cbLight.Checked)
{
if (nLightMin.Enabled == false && nLightMax.Enabled == false)
{
_structCategoryType = Light;
CheckStructureSheets();
}
else
{
if (nLightMin.Enabled && nLightMin.Value > 0)
{
if (nXLightMax.Enabled && nLightMin.Enabled && nLightMax.Enabled == false)
{
_dMin = nLightMin.Value;
_structCategoryType = Light;
CheckStructureSheets();
}
else
{
if (nLightMax.Value > 0)
{
_dMin = nLightMin.Value;
_dMax = nLightMax.Value;
_structCategoryType = Light;
CheckStructureSheets();
}
else
{
MessageBox.Show(#"Light Max cannot be zero (0)");
return;
}
}
}
else if (nLightMin.Enabled == false && nLightMax.Enabled)
{
if (nLightMax.Value > 0)
{
_dMax = nLightMax.Value;
_structCategoryType = Light;
CheckStructureSheets();
}
else
{
MessageBox.Show(#"Light Max cannot be zero (0)");
}
}
else
{
MessageBox.Show(#"Light Min cannot be zero (0)");
return;
}
}
}
Hope this helps someone.
Tim

thanks for #AlexJoliq and #BrettCaswell. just want to inform that before Alex edited his answer from using "==" to "!=", i (thought) already solved the problem. but i don't know where is the more effective and efficient way, alex's or mine.
below is my code for DisableIfValueIsTrue():
if (add1 + add2 == sum.Value) sum.Enabled = false;
if (add1 - add2 == difference.Value) difference.Enabled = false;
if (add1 * add2 == product.Value) product.Enabled = false;
if (add1 / add2 == quotient.Value) quotient.Enabled = false;

Mixed managed C++ method does not always return the same result to the calling C# code

A C++ method returns the correct value when I use a conditional breakpoint, but an incorrect value without a breakpoint.
C# method which calls C++:
bool SetProperty(Element element, Node referencePoint, List<Materializer> materializers, List<ulong> properties)
{
// Loop over STLs
for (int i = 0; i < materializers.Count; i++)
{
Materializer materializer = materializers[i];
if (materializer.IsPointInside(referencePoint.X, referencePoint.Y, referencePoint.Z, pentalTreeDatasets[i].top))
{
element.PropertyId = properties[i];
return true;
};
}
return false;
}
C++ methods in the header file:
int CountIntersects(double x, double y, double z, PentalTreeNode ^root)
{
Math3d::M3d rayPoints[2], intersectionPoint;
rayPoints[0].set(x,y,z);
rayPoints[1].set(x,y,1.0e6);
if(!root)
return 0;
else
{
int special = CountIntersects(x,y,z,root->special);
if (x <= root->xMax && x >= root->xMin && y <= root->yMax && y >= root->yMin)
{
if( _stlMesh->IsRayIntersectsPoly(root->index, rayPoints, intersectionPoint))
{
return (1 + special);
}
else
return special;
}
else
{
if (y>root->yMax)
{
return (CountIntersects(x,y,z,root->top)+special);
}
else if(y<root->yMin)
{
return (CountIntersects(x,y,z,root->bottom)+special);
}
else if(x<root->xMin)
{
return (CountIntersects(x,y,z,root->left)+special);
}
else if(x>root->xMax)
{
return (CountIntersects(x,y,z,root->right)+special);
}
else
return special;
}
}
}
bool IsPointInside(double x, double y, double z, PentalTreeNode ^root)
{
int intersectionCount = 0;
Math3d::M3d rayPoints[2], intersectionPoint;
rayPoints[0].set(x,y,z);
rayPoints[1].set(x,y,1.0e6);
if(_box->IsContainingPoint(x,y,z))
{
intersectionCount=CountIntersects(x,y,z,root);
return (intersectionCount%2!=0);
}
}
C++ methods in other header files:
bool IsRayIntersectsPoly(int nPolygonIndex, Math3d::M3d RayPoints[2], CVector3D& IntersectionPoint)
{
CMeshPolygonBase& Poly = m_PolygonArray[nPolygonIndex];
CArrayResultI Result;
int* pPolygonPoints = GetPolygonPoints(Poly, Result);
Math3d::MPlane TrianglePlane;
double Atmp[3], A;
CVector3D* pPoints[3];
pPoints[0] = &m_PointArray[*pPolygonPoints].m_Position;
for(int i = 1; i < Result.GetSize() - 1; i++)
{
pPoints[1] = &m_PointArray[*(pPolygonPoints+i)].m_Position;
pPoints[2] = &m_PointArray[*(pPolygonPoints+i+1)].m_Position;
TrianglePlane.Init(*pPoints[0], *pPoints[1], *pPoints[2]);
TrianglePlane.IntersectLine(RayPoints[0], RayPoints[1], IntersectionPoint);
A = GetTriangleArea(*pPoints[0], *pPoints[1], *pPoints[2]);
for(int j = 0; j < 3; j++)
{
Atmp[j] = GetTriangleArea(*pPoints[j], *pPoints[(j+1)%3], IntersectionPoint);
}
if( fabs(A - Atmp[0] - Atmp[1] - Atmp[2]) < 1.0e-5 ) return true;
}
return false;
};
double GetTriangleArea(CVector3D& T1, CVector3D& T2, CVector3D& T3)
{
double a, b, c, s;
a = (T1 - T2).length();
b = (T2 - T3).length();
c = (T3 - T1).length();
s = 0.5 * (a + b + c);
return( sqrt(s * (s - a)* (s - b)* (s - c)) );
}
When I start the program which calls SetProperty() within the for-loop, the results for some iterator values are wrong. When I set conditional breakpoints for critical iterator values in the for-loop and step over it, then the result is OK for that item. What may be the problem?
This is method in which I post breakpoint. For example, for critical element.Id==2393.
private void StartButton_Click(object sender, EventArgs e)
{
DateTime startTime = DateTime.Now;
List<Materializer> materializers = new List<Materializer>();
List<ulong> properties = new List<ulong>();
// Load STLs
for (int i = 0; (int)i < (this.dataGridView.RowCount - 1); i++)
{
if (dataGridView.Rows[i].Cells[1].Value != null && (string)dataGridView.Rows[i].Cells[1].Value != "")
{
Materializer materializer = new Materializer();
materializer.LoadSTLMesh(dataGridView.Rows[i].Cells[0].Value.ToString());
materializers.Add(materializer);
properties.Add((ulong)dataGridView.Rows[i].Cells[1].Tag);
}
}
CreatePentalTrees(materializers);
int processedElementCount = 0;
int changedElementCount = 0;
// Loop over elements
foreach (Element element in model.ElementsList.Values)
if ((element.Topology == 7 || element.Topology == 8) && !lockedProperties.ContainsKey(element.PropertyId)) // 3D elements only
{
Node center = this.CenterPoint(element, model.NodesList);
if (element.Id == 2393)
{
//if breakpoints thats ok, else not ok
Console.WriteLine(element.Id);
Console.WriteLine(element.PropertyId);
}
if (SetProperty(element, center, materializers, properties)) // Check for center point
{
//changedElements.Add(element.Id, true);
changedElementCount++;
}
else
{
// Check for all nodes if center point does not belong to any STL
int[] nodeOrder;
switch (element.Topology)
{
case 7:
nodeOrder = wedgeNodeOrder;
break;
case 8:
nodeOrder = brickNodeOrder;
break;
default:
throw new Exception("Unknown topology " + element.Topology.ToString());
}
for (int i = 0; i < nodeOrder.Length; i++)
{
Node node = model.NodesList[element.NodeIds[nodeOrder[i]]];
if (SetProperty(element, node, materializers, properties))
{
//changedElements.Add(element.Id, true);
changedElementCount++;
break;
}
}
}
if (++processedElementCount % 100 == 0)
{
labelTime.Text = "Changed/processed elements: " + changedElementCount.ToString() + "/" + processedElementCount.ToString();
labelTime.Refresh();
Application.DoEvents();
}
}
DateTime endTime = DateTime.Now;
labelTime.Text = "Total time: " + (endTime - startTime).TotalSeconds.ToString() + " s";
MessageBox.Show("Completed.");
SaveFileDialog saveFileDlg = new SaveFileDialog();
saveFileDlg.Title = "Save FEMAP neutral file";
saveFileDlg.Filter = "(*.neu)|*.neu";
if (saveFileDlg.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
FemapNeutral.ExportNeu(saveFileDlg.FileName, model);
}
}

You seem to be calling a lot of methods you haven't listed, and/or the wall of code made me get lost. Adding that code won't help: reducing your problem to a simpler one that demonstrates the problem might.
However, the most likely cause of your problem, if you have unmanaged code reading managed data, is that you failed to marshal or pin the data prior to using the managed code.
Unpinned data can be moved around by the garbage collector in unexpected ways.

Richtextbox lines count

I'm developing a text editor in C#, and I'm trying to make a line count.
private void updateNumberLabel()
{
Point pos = new Point(0, 0);
int firstIndex = Document.GetCharIndexFromPosition(pos);
int firstLine = Document.GetLineFromCharIndex(firstIndex);
pos.X = ClientRectangle.Width;
pos.Y = ClientRectangle.Height;
int lastIndex = Document.GetCharIndexFromPosition(pos);
int lastLine = Document.GetLineFromCharIndex(lastIndex);
int actualLine = Document.GetLineFromCharIndex(actualPos);
pos = Document.GetPositionFromCharIndex(lastIndex);
if (lastLine != actualLine)
{
numberLabel.Text = "";
for (int i = firstLine; i <= lastLine + 1; i++)
{
numberLabel.Text += i + 1 + "\n";
}
}
}
It works fine and adds the number of lines while you write them, but if you delete one, it will only update if you delete or add one more line.
I want make it instantaneous. If you delete one, the count shall be decreased instantaneously.

Maybe this is too easy, but what about that:
private void richTextBox1_TextChanged(object sender, EventArgs e)
{
var lineCount = richTextBox.Lines.Count();
numberLabel.Text = lineCount.ToString();
}
Make sure you assign it to the TextChanged event.
If this is not what you need, please add some more information what you are trying to achieve.

I'm really late, but Lines is an array of string. Just get the length.
richTexBox.Lines.Length.ToString();

I have found one open source and applied it to this problem.
I have confirmed that it works well and have implemented it.
RichTextBox Colums and Row
Simple Code(
The link has a demo source.):
this.rtb.CursorPositionChanged +=
new System.EventHandler(this.rtb_CursorPositionChanged);
this.rtb.SelectionChanged +=
new System.EventHandler(this.rtb_SelectionChanged);
.
.
.
private void rtb_CursorPositionChanged(object sender, System.EventArgs e)
{
int line = rtb.CurrentLine;
int col = rtb.CurrentColumn;
int pos = rtb.CurrentPosition;
statusBar.Text = "Line " + line + ", Col " + col +
", Position " + pos;
}
private void rtb_SelectionChanged(object sender, System.EventArgs e)
{
int start = rtb.SelectionStart;
int end = rtb.SelectionEnd;
int length = rtb.SelectionLength;
statusBar.Text = "Start " + start + ", End " + end +
", Length " + length;
}
namespace Nik.UserControls
{
public class RicherTextBox2 : System.Windows.Forms.RichTextBox
{
public event EventHandler CursorPositionChanged;
protected virtual void OnCursorPositionChanged( EventArgs e )
{
if ( CursorPositionChanged != null )
CursorPositionChanged( this, e );
}
protected override void OnSelectionChanged( EventArgs e )
{
if ( SelectionLength == 0 )
OnCursorPositionChanged( e );
else
base.OnSelectionChanged( e );
}
public int CurrentColumn
{
get { return CursorPosition.Column( this, SelectionStart ); }
}
public int CurrentLine
{
get { return CursorPosition.Line( this, SelectionStart ); }
}
public int CurrentPosition
{
get { return this.SelectionStart; }
}
public int SelectionEnd
{
get { return SelectionStart + SelectionLength; }
}
}
internal class CursorPosition
{
[System.Runtime.InteropServices.DllImport("user32")]
public static extern int GetCaretPos(ref Point lpPoint);
private static int GetCorrection(RichTextBox e, int index)
{
Point pt1 = Point.Empty;
GetCaretPos(ref pt1);
Point pt2 = e.GetPositionFromCharIndex(index);
if ( pt1 != pt2 )
return 1;
else
return 0;
}
public static int Line( RichTextBox e, int index )
{
int correction = GetCorrection( e, index );
return e.GetLineFromCharIndex( index ) - correction + 1;
}
public static int Column( RichTextBox e, int index1 )
{
int correction = GetCorrection( e, index1 );
Point p = e.GetPositionFromCharIndex( index1 - correction );
if ( p.X == 1 )
return 1;
p.X = 0;
int index2 = e.GetCharIndexFromPosition( p );
int col = index1 - index2 + 1;
return col;
}
}
}

Los799
Sorry for answering a "bit" late, I saw this question just now.
But if the problem still stands, here's a simple way to count lines, just use a foreach loop:
int CountOfLines = 1;//1 because min 1 line is always in a text of a control, that has a Text property
foreach (char c in YourText)
{
if (c == '\r' | c == '\n')//these are all equal the ENTER key
{
CountOfLines++;
}
}
You can also use foreach to count characters as well, but with foreach you can choose characters, that you don't want to be counted in the count of characters. For example:
int CountOfCharacters = 0;//0 because by default there are no characters in a textbox or label.
foreach (char c in YourText)
{
if (c != '\t' & c != '\n' & c != '\r')//in this example I want to count only the characters that are not an ENTER or a TAB.
{
CountOfCharacters++;
}
}
Hope this helps you and everybody else, who's reading this, even if it's a bit late answer. :)

Instead of trying to battle with the default rich text box, why don't you try making your own control so you have full control of the text formatting?
After all, if you're developing your own text editor, it would make sense to have text stored and managed in a way that makes sense to you, the developer, instead of trying to fight with a format designed for a slightly different purpose.

Newer solution to this question for WPF applications
DOK1 is a WPF flow document
TX1 is a TextBox control
TX1.Text = DOK1.Blocks.Count.ToString();

When I redo using this undo/redo code, the first thing undone cannot be redone

I am using the following code in order to implement undo/redo into my application:
public struct UndoSection
{
public string Undo;
public int Index;
}
--
public UndoSection(int index, string undo)
{
Index = index;
Undo = undo;
}
--
Stack<UndoSection> UndoStack = new Stack<UndoSection>();
private void Form1_KeyDown(object sender, KeyEventArgs e)
{
if (e.Modifiers == Keys.None && e.KeyCode == Keys.Delete)
UndoStack.Push(new UndoSection(richTextBoxPrintCtrl1.SelectionStart, richTextBoxPrintCtrl1.SelectedText));
else if (e.Control && e.KeyCode == Keys.Z)
{
e.Handled = true;
undo_Click(richTextBoxPrintCtrl1, new EventArgs());
}
}
public string[] RTBRedoUndo;
public int StackCount = 0;
public int OldLength = 0;
public int ChangeToSave = 5;
public bool IsRedoUndo = false;
--
public void RTBTextChanged()
{
if (richTextBoxPrintCtrl1.TextLength - OldLength >= ChangeToSave | richTextBoxPrintCtrl1.TextLength - OldLength <= ChangeToSave)
{
StackCount += 1;
RTBRedoUndo[StackCount] = richTextBoxPrintCtrl1.Text;
}
}
public void UndoCode()
{
IsRedoUndo = true;
if (StackCount > 0 && RTBRedoUndo[StackCount - 1] != null)
{
StackCount = StackCount - 1;
richTextBoxPrintCtrl1.Text = RTBRedoUndo[StackCount];
}
}
public void RedoCode()
{
if (IsRedoUndo == false && richTextBoxPrintCtrl1.Text.Substring(richTextBoxPrintCtrl1.Text.Length - 1, 1) == " ")
IsRedoUndo = true;
if (StackCount > 0 && RTBRedoUndo[StackCount + 1] != null)
{
StackCount = StackCount + 1;
richTextBoxPrintCtrl1.Text = RTBRedoUndo[StackCount];
}
However, if I type some text in my rich text box such as: "Hello. This is my application.", It will only let me redo up to "my". It won't let me redo "application.". And if I undo all text, I then cannot redo and restore the text.
What is causing this to behave in this manner? I really need to get this undo/redo code working correct. Could somebody help point me in the right direction, please?
--EDIT--
Redo code:
public void RedoCode()
{
if (IsRedoUndo == false && richTextBoxPrintCtrl1.Text.Substring(richTextBoxPrintCtrl1.Text.Length - 1, 1) == " ")
IsRedoUndo = true;
if (StackCount > 0 && RTBRedoUndo[StackCount + 1] != null)
{
StackCount = StackCount + 1;
richTextBoxPrintCtrl1.Text = RTBRedoUndo[StackCount];
}
}
It is called by a button click, using RedoCode();

Can you show how to call the Redo function?
as from what I can see you've missed out the below code
private void Form1_KeyDown(object sender, KeyEventArgs e)
{
if (e.Modifiers == Keys.None && e.KeyCode == Keys.Delete)
UndoStack.Push(new UndoSection(richTextBoxPrintCtrl1.SelectionStart, richTextBoxPrintCtrl1.SelectedText));
else if (e.Control && e.KeyCode == Keys.Z)
{
e.Handled = true;
undo_Click(richTextBoxPrintCtrl1, new EventArgs());
}
else if (e.Control && e.KeyCode == Keys.Y)
{
e.Handled = true;
redo_Click(richTextBoxPrintCtrl1, new EventArgs());
}

Numbered list on Richtextbox

I'm trying to add numbered list functionality to a text editor. RichTextbox already provides the SelectionBullet property to change a selection to a bulleted list. But i was unable to find a similar property to generate numbered list. Is there any standard way to create a numbered list on Richtextbox. If not, i would have to implement it myself so code snips that could help me do that will help, Thank you.

I know that a link is not gernerally accepted as a good answer, however the article RichTextBox with Search Line Numbering, Bulleting, Printing, Searching Support on CodeProject could probably help you out quite a bit with what you are looking for.
In this article, the author extends the RichTextBox control into something that can do what you are asking (and more), plus the code is posted there for all to see.

Well, i implemented it as follows.
private void btnNumbers_Click(object sender, EventArgs e)
{
string temptext = rtbMain.SelectedText;
int SelectionStart = rtbMain.SelectionStart;
int SelectionLength = rtbMain.SelectionLength;
rtbMain.SelectionStart = rtbMain.GetFirstCharIndexOfCurrentLine();
rtbMain.SelectionLength = 0;
rtbMain.SelectedText = "1. ";
int j = 2;
for( int i = SelectionStart; i < SelectionStart + SelectionLength; i++)
if (rtbMain.Text[i] == '\n')
{
rtbMain.SelectionStart = i + 1;
rtbMain.SelectionLength = 0;
rtbMain.SelectedText = j.ToString() + ". ";
j++;
SelectionLength += 3;
}
}
private void rtbMain_KeyDown(object sender, KeyEventArgs e)
{//this piece of code automatically increments the bulleted list when user //presses Enter key
int tempNum;
if (e.KeyCode == Keys.Enter)
try
{
if (char.IsDigit(rtbMain.Text[rtbMain.GetFirstCharIndexOfCurrentLine()]))
{
if (char.IsDigit(rtbMain.Text[rtbMain.GetFirstCharIndexOfCurrentLine() + 1]) && rtbMain.Text[rtbMain.GetFirstCharIndexOfCurrentLine() + 2] == '.')
tempNum = int.Parse(rtbMain.Text.Substring(rtbMain.GetFirstCharIndexOfCurrentLine(),2));
else tempNum = int.Parse(rtbMain.Text[rtbMain.GetFirstCharIndexOfCurrentLine()].ToString());
if (rtbMain.Text[rtbMain.GetFirstCharIndexOfCurrentLine() + 1] == '.' || (char.IsDigit(rtbMain.Text[rtbMain.GetFirstCharIndexOfCurrentLine() + 1]) && rtbMain.Text[rtbMain.GetFirstCharIndexOfCurrentLine() + 2] == '.'))
{
tempNum++;
rtbMain.SelectedText = "\r\n" + tempNum.ToString() + ". ";
e.SuppressKeyPress = true;
}
}
}
catch{}
}

Here is my answer... which is easily readable and refineable. I took a much different approach but added the ability to remove the numbered list within the selection if it already exists. Please note that so far I have only lightly tested it and it seems to work good... but it may need further refinement.
private void btnOrdered_Click(object sender, EventArgs e)
{
string[] splitSelection = null;
// If selection split selection else split everything
if (this.txtCaptionEditor.SelectionLength > 0)
{
splitSelection = this.txtCaptionEditor.SelectedText.Replace("\r\n", "\n").Split("\n".ToCharArray());
}
else
{
splitSelection = this.txtCaptionEditor.Text.Replace("\r\n", "\n").Split("\n".ToCharArray());
}
bool Exists = false;
for (int i = 0; i < splitSelection.GetLength(0); i++)
{
// If Ordered List Allready exists in selection then remove else add
if (!string.IsNullOrEmpty(splitSelection[i]))
{
if (splitSelection[i].Substring(0, 2) == "1.") { Exists = true; }
}
}
for (int i = 0; i < splitSelection.GetLength(0); i++)
{
int lineCount = (i + 1);
if (Exists)
{
this.txtCaptionEditor.Text = this.txtCaptionEditor.Text.Replace(Convert.ToString(lineCount) + ". ", "");
}
else
{
if(!string.IsNullOrEmpty(splitSelection[i]))
{
this.txtCaptionEditor.Text = this.txtCaptionEditor.Text.Replace(splitSelection[i], Convert.ToString(lineCount) + ". " + splitSelection[i]);
}
}
}
}
private void txtCaptionEditor_KeyDown(object sender, KeyEventArgs e)
{
string[] splitSelection = this.txtCaptionEditor.Text.Replace("\r\n", "\n").Split("\n".ToCharArray());
if (e.KeyCode == Keys.Enter)
{
// Get Current Line Position
int currentLine = this.txtCaptionEditor.GetLineFromCharIndex(this.txtCaptionEditor.SelectionStart);
// Only Run if the previous line is greater than zero
if ((currentLine) >= 0)
{
// Loop through 100 possible numbers for match you can go higher
// If you think your numbered list could go above 100
for (int i = 0; i < 100; i++)
{
if (splitSelection[(currentLine)].Substring(0, 2) == Convert.ToString((i + 1)) + ".")
{
// If the substring of the current line equals a numbered list value.. enumerate next line
this.txtCaptionEditor.SelectedText = "\n" + (i + 2) + ". ";
e.SuppressKeyPress = true;
}
}
}
}
}