Develop Reference

How can I pass images from a dynamically generated image to a specific MS WORD table?

There is a form in which there are text lines, and a flowLayotpanel for accepting dynamically created pictureboxes, please tell me the code for implementing the transfer of images (in this case, from 1 to 3 pieces) to the MS WORD template For text, the transfer is implemented, I can not find a suitable solution for images
example code like this
using DirectShowLib;
using Emgu.CV;
using Emgu.CV.CvEnum;
using Emgu.CV.Structure;
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Windows.Forms;
using Word = Microsoft.Office.Interop.Word;
private readonly string TemplateFileName = #"D:\BASE\1.docx";
private void btn_scrennshot_Click(object sender, EventArgs e)
{
try
{
if (!Directory.Exists(#"D:\BASE\Images"))
{
Directory.CreateDirectory(#"D:\BASE\Images");
MessageBox.Show("OK");
}
else
{
string path = #"D:\BASE\Images";
pictureBox1.Image.Save(path + #"\" + textBox_3.Text + DateTime.Now.Hour + DateTime.Now.Minute + DateTime.Now.Second + ".jpeg", ImageFormat.Jpeg);
}
var panel = new TableLayoutPanel();
panel.AutoSize = true;
Mat m = new Mat();
capture.Retrieve(m);
var pb = new PictureBox();
pb.Image = new Bitmap(m.ToImage<Bgr, byte>().Flip(Emgu.CV.CvEnum.FlipType.None).Bitmap);
pb.SizeMode = PictureBoxSizeMode.Zoom;
pb.Name = $"SMV_{textBox_3.Text + DateTime.Now.Hour + DateTime.Now.Minute + DateTime.Now.Second}";
pb.Height = pb.Image.Height / 10;
pb.Width = pb.Image.Width / 10;
var name = new Label();
name.Text = $"SMV_{textBox_3.Text + DateTime.Now.Hour + DateTime.Now.Minute + DateTime.Now.Second}";
var exportimage_btn = new Button();
exportimage_btn.Text = "Select";
exportimage_btn.Click += Exportimage_btn_Click;
var deleteimage_btn = new Button();
deleteimage_btn.Text = "Delete";
deleteimage_btn.Click += Deleteimage_btn_Click;
panel.Controls.Add(pb);
panel.Controls.Add(name);
panel.Controls.Add(exportimage_btn);
panel.Controls.Add(deleteimage_btn);
flowLayoutPanel1.Controls.Add(panel);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Error!", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
private void Deleteimage_btn_Click(object sender, EventArgs e)
{
var deleteButton = (Button)sender;
var tableLayoutPanel = deleteButton.Parent;
var flowLayoutPanel1 = tableLayoutPanel.Parent;
flowLayoutPanel1.Controls.Remove(tableLayoutPanel);
foreach (Control control in tableLayoutPanel.Controls)
control.Dispose();
tableLayoutPanel.Dispose();
}
private void Exportimage_btn_Click(object sender, EventArgs e)
{
var exportButton = (Button)sender;
var tableLayoutPanel = exportButton.Parent;
tableLayoutPanel.Controls.Remove(exportButton);
flowLayoutPanel_images.Controls.Add(tableLayoutPanel);
exportButton.Dispose();
}
private void btn_close_Click(object sender, EventArgs e)
{
Application.Exit();
}
private void btn_export_Click(object sender, EventArgs e)
{
var text1 = textBox_2.Text;
var text2 = textBox_2.Text;
var text3 = textBox_3.Text;
var text4 = textBox_4.Text;
var data1 = dateTimePicker_1.Value.ToShortDateString();
var data2 = dateTimePicker_2.Value.ToShortDateString();
var text5 = textBox_5.Text;
var text6 = textBox_6.Text;
var text7 = comboBox_1.Text;
var text8 = comboBox_2.Text;
var text9 = comboBox_3.Text;
var text10 = comboBox_4.Text;
var text11 = textBox_7.Text;
var text12 = textBox_8.Text;
var text13 = comboBox_5.Text;
var text14 = textBox_9.Text;
//TODO WORD
var wordApp = new Word.Application();
wordApp.Visible = false;
try
{
var wordDocument = wordApp.Documents.Open(TemplateFileName);
ReplaceWordStub("{text1}", text1, wordDocument);
ReplaceWordStub("{text2}", text2, wordDocument);
ReplaceWordStub("{text3}", text3, wordDocument);
ReplaceWordStub("{text4}", text4, wordDocument);
ReplaceWordStub("{data1}", data1 wordDocument);
ReplaceWordStub("{text5}", text5, wordDocument);
ReplaceWordStub("{data2}", data2, wordDocument);
ReplaceWordStub("{text6}", text6, wordDocument);
ReplaceWordStub("{text7}", text7, wordDocument);
ReplaceWordStub("{text8}", text8, wordDocument);
ReplaceWordStub("{text9}", text9, wordDocument);
ReplaceWordStub("{text10}", text10, wordDocument);
ReplaceWordStub("{text11}", text11, wordDocument);
ReplaceWordStub("{text12}", text12, wordDocument);
ReplaceWordStub("{text13}", text13, wordDocument);
ReplaceWordStub("{text14}", text14, wordDocument);
wordDocument.SaveAs2(#"D:\BASE\2.docx");
wordApp.Visible = true;
}
catch
{
MessageBox.Show("Error!");
}
}
private void ReplaceWordStub(string stubToReplace, string text, Word.Document wordDocument)
{
var range = wordDocument.Content;
range.Find.ClearFormatting();
range.Find.Execute(FindText: stubToReplace, ReplaceWith: text);
}

Because I don't have a camera, I use an existing picture to add. Then add it and save it to the folder at the same time, keeping the picture name consistent.
You can modify it according to your actual situation, I'm just doing it as a demonstration.
If you have questions about my code, please add a comment below.
First, add a bookmark in the template:
Use selection to find the bookmark position and start importing pictures.
bk.Select();
Selection sel = wordApp.Selection;
sel.InlineShapes.AddPicture("//path");
Export code:
private void btn_export_Click(object sender, EventArgs e) {
//TODO WORD
var wordApp = new Word.Application();
wordApp.Visible = false;
try {
var wordDocument = wordApp.Documents.Open(TemplateFileName);
//Through the Applicatin property of Document, we can get the Applicatin object in turn.
wordApp = wordDocument.Application;
wordDocument.ActiveWindow.Visible = true;
foreach (Bookmark bk in wordDocument.Bookmarks) {
if (bk.Name == "picture") {
//Use the Selection object to insert a picture
bk.Select();
Selection sel = wordApp.Selection;
//Traverse the big panel to find all the small panels
foreach (Control img in flowLayoutPanel_images.Controls) {
//Traverse the small panel to find the label
foreach (Control label in img.Controls) {
if (label is Label)
//Determine the picture to be added from the folder according to the text of the label
sel.InlineShapes.AddPicture(#"C:/demo/images/" + label.Text + ".png");
}
}
}
}
wordDocument.SaveAs(#"C:/demo/images/2.docx");
wordApp.Quit();
} catch {
MessageBox.Show("Error!");
}
}
Schematic diagram:
word：
app:
Start:
Output:
After:

how to show inherit groupbox in C#

My english isn't very good.
Hi, I have class where I inherit from GroupBox and I want to use polymorphism and I see in debugger that all is corrent but after compilation I see nothing...
Here is screenshot like it is and how it should be.
grid = new Grid.KierownikGrid();
SetGrid();
private void SetGrid()
{
grid.Location = new System.Drawing.Point(1, 0);
grid.Size = new System.Drawing.Size(10,10);
grid.TabIndex = 10;
grid.TabStop = false;
grid.Text = "";
}
public class KierownikGrid : GroupBox
{
RadioButton addUsers;
RadioButton deleteUsers;
RadioButton troubles;
public KierownikGrid()
:base()
{
Inicjacja();
}
protected void Inicjacja()
{
this.Controls.Add(addUsers = new RadioButton());
this.Controls.Add(deleteUsers = new RadioButton());
this.Controls.Add(troubles = new RadioButton());
this.addUsers.AutoSize = true;
this.addUsers.Checked = true;
this.addUsers.Location = new System.Drawing.Point(3, 10);
this.addUsers.TabIndex = 0;
this.addUsers.TabStop = true;
this.addUsers.Text = "Dodaj użytkownika";
this.addUsers.UseVisualStyleBackColor = true;
this.deleteUsers.AutoSize = true;
this.deleteUsers.Location = new System.Drawing.Point(125, 10);
this.deleteUsers.TabIndex = 1;
this.deleteUsers.Text = "Usuń użytkownika";
this.deleteUsers.UseVisualStyleBackColor = true;
this.troubles.AutoSize = true;
this.troubles.Location = new System.Drawing.Point(250, 10);
this.troubles.TabIndex = 2;
this.troubles.Text = "Problemy";
this.troubles.UseVisualStyleBackColor = true;
}
}
https://i.stack.imgur.com/DFu4t.png
https://i.stack.imgur.com/Dqeim.png

As #BugFinder already mentioned you have to add your control to a form.
There is a tutorial for that.
public class Form1 : System.Windows.Forms.Form
{
//Controls.
private TextBox txtBox = new TextBox();
private Button btnAdd = new Button();
private ListBox lstBox = new ListBox();
private CheckBox chkBox = new CheckBox();
private Label lblCount = new Label();
private void Form1_Load(object sender, EventArgs e)
{
//Add controls to the form.
this.Controls.Add(btnAdd);
this.Controls.Add(txtBox);
this.Controls.Add(lstBox);
this.Controls.Add(chkBox);
this.Controls.Add(lblCount);
}
}

Show WinFrm from C# console application and wait to close

I am trying to show a WinForm (inputbox) from a console application in C# and wait until the user closes the form. It is important for me to have the inputbox ontop and active when it opens. ShowDialog() is not working in my case as in some cases it does not appears as an active form. So I'd like to change my code and use Show(). This way I can manually make find out if the form is active or not and if not activate it myself. With ShowDialog(). my code stops and I can not do anything until the from is closed.
Below is my code. It does show the inputbox, however it is frozen. What am I doing wrong please? As clear the while-loop after "inputBox.Show();" is not doing anything, but if I can manage to run the loop and the inputbox does not freeze, I will sort out the rest myself. I appreciate your help.
public static string mInputBox(string strPrompt, string strTitle, string strDefaultResponse)
{
string strResponse = null;
Form inputBox = new Form();
inputBox.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedToolWindow;
inputBox.ClientSize = new Size(500, 85);
inputBox.Text = strTitle;
inputBox.StartPosition = System.Windows.Forms.FormStartPosition.Manual;
inputBox.Left = (Screen.PrimaryScreen.Bounds.Size.Width / 2) - (inputBox.ClientSize.Width / 2);
inputBox.Top = (Screen.PrimaryScreen.Bounds.Size.Height / 2) - (inputBox.ClientSize.Height / 2);
Label lblPrompt = new Label();
lblPrompt.Text = strPrompt;
inputBox.Controls.Add(lblPrompt);
TextBox textBox = new TextBox();
textBox.Text = strDefaultResponse;
inputBox.Controls.Add(textBox);
Button okButton = new Button();
okButton.Text = "&OK";
inputBox.Controls.Add(okButton);
Button cancelButton = new Button();
cancelButton.Text = "&Cancel";
inputBox.Controls.Add(cancelButton);
okButton.Click += (sender, e) =>
{
strResponse = textBox.Text;
inputBox.Close();
};
cancelButton.Click += (sender, e) =>
{
inputBox.Close();
};
inputBox.AcceptButton = okButton;
inputBox.CancelButton = cancelButton;
SetWindowPos(inputBox.Handle, HWND_TOPMOST, inputBox.Left, inputBox.Top, inputBox.Width, inputBox.Height, NOACTIVATE);
inputBox.Show();
while {true}
Thread.Sleep(100);
Application.DoEvents();
return strResponse;
}

I'm not sure why you are taking this route, I'm sure there are better ways to do it (explain one at the end). however to make your code run you should add Application.DoEvents() inside your loop
the code should be something like this:
var formActive = true;
inputBox.FormClosed += (s, e) => formActive = false;
inputBox.Show();
inputBox.TopMost = true;
inputBox.Activate();
while (formActive)
{
Thread.Sleep(10);
Application.DoEvents();
}
and the whole method will be:
public static string mInputBox(string strPrompt, string strTitle, string strDefaultResponse)
{
string strResponse = null;
Form inputBox = new Form();
inputBox.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedToolWindow;
inputBox.ClientSize = new Size(500, 85);
inputBox.Text = strTitle;
inputBox.StartPosition = System.Windows.Forms.FormStartPosition.Manual;
inputBox.Left = (Screen.PrimaryScreen.Bounds.Size.Width/2) - (inputBox.ClientSize.Width/2);
inputBox.Top = (Screen.PrimaryScreen.Bounds.Size.Height/2) - (inputBox.ClientSize.Height/2);
Label lblPrompt = new Label();
lblPrompt.Text = strPrompt;
inputBox.Controls.Add(lblPrompt);
TextBox textBox = new TextBox();
textBox.Text = strDefaultResponse;
inputBox.Controls.Add(textBox);
Button okButton = new Button();
okButton.Text = "&OK";
inputBox.Controls.Add(okButton);
Button cancelButton = new Button();
cancelButton.Text = "&Cancel";
inputBox.Controls.Add(cancelButton);
okButton.Click += (sender, e) =>
{
strResponse = textBox.Text;
inputBox.Close();
};
cancelButton.Click += (sender, e) =>
{
inputBox.Close();
};
inputBox.AcceptButton = okButton;
inputBox.CancelButton = cancelButton;
var formActive = true;
inputBox.FormClosed += (s, e) => formActive = false;
inputBox.Show();
inputBox.TopMost = true;
inputBox.Activate();
while (formActive)
{
Thread.Sleep(10);
Application.DoEvents();
}
return strResponse;
}
but I think it would be a better Idea to Derive from Form and create a InputBox and set TopMost and call Activate OnLoad to create what you need, then simply call ShowDialog, something like:
class Inputbox : Form
{
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
TopMost = true;
Activate();
}
}
and better to put UI code in InputBox class as the whole code and usage would be like:
class Inputbox : Form
{
public string Response { get; set; }
public Inputbox(string strTitle, string strPrompt, string strDefaultResponse)
{
//add UI and Controls here
FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedToolWindow;
ClientSize = new Size(500, 85);
Text = strTitle;
StartPosition = System.Windows.Forms.FormStartPosition.Manual;
Left = (Screen.PrimaryScreen.Bounds.Size.Width/2) - (ClientSize.Width/2);
Top = (Screen.PrimaryScreen.Bounds.Size.Height/2) - (ClientSize.Height/2);
Label lblPrompt = new Label();
lblPrompt.Text = strPrompt;
Controls.Add(lblPrompt);
TextBox textBox = new TextBox();
textBox.Text = strDefaultResponse;
Controls.Add(textBox);
Button okButton = new Button();
okButton.Text = "&OK";
Controls.Add(okButton);
Button cancelButton = new Button();
cancelButton.Text = "&Cancel";
Controls.Add(cancelButton);
okButton.Click += (sender, e) =>
{
Response = textBox.Text;
Close();
};
cancelButton.Click += (sender, e) =>
{
Close();
};
AcceptButton = okButton;
CancelButton = cancelButton;
}
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
TopMost = true;
Activate();
}
}
public static string mInputBox(string strPrompt, string strTitle, string strDefaultResponse)
{
string strResponse = null;
Inputbox inputBox = new Inputbox(strPrompt,strTitle,strDefaultResponse);
inputBox.ShowDialog();
return inputBox.Response;
}

You need to run a message loop:
Application.Run(inputBox);

How do I use the save feature on tabcontols?

I have a form where I can add tabs into a tabcontrol by pressing a button on the form. There are 4 textboxes and then the name of the tab. I have added using system.io;
Where would I even start to create a save for all of the tabs? I have the save button created, I just don't know where to start. I would guess I would need a loop of some kind.
namespace WindowsFormsApplication4
{
public partial class Form1 : Form
{
public string status = "no";
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
string name = txtName.Text;
//validate information
try { }
catch { }
//create new tab
string title = name;
TabPage myTabPage = new TabPage(title);
tabControl1.TabPages.Add(myTabPage);
//Add Labels
Label lb = new Label();
lb.Text = "Denomination:";
lb.Location = new System.Drawing.Point(150, 75);
lb.Name = "lbl";
lb.Size = new System.Drawing.Size(100, 20);
myTabPage.Controls.Add(lb);
Label lb2 = new Label();
lb2.Text = "Year:";
lb2.Location = new System.Drawing.Point(150, 120);
lb2.Name = "lbl2";
lb2.Size = new System.Drawing.Size(100, 20);
myTabPage.Controls.Add(lb2);
Label lb3 = new Label();
lb3.Text = "Grade:";
lb3.Location = new System.Drawing.Point(150, 165);
lb3.Name = "lbl3";
lb3.Size = new System.Drawing.Size(100, 20);
myTabPage.Controls.Add(lb3);
Label lb4 = new Label();
lb4.Text = "Mint Mark:";
lb4.Location = new System.Drawing.Point(150, 210);
lb4.Name = "lbl4";
lb4.Size = new System.Drawing.Size(100, 20);
myTabPage.Controls.Add(lb4);
//Add text boxes
TextBox tb = new TextBox();
tb.Location = new System.Drawing.Point(250, 75);
tb.Name = "txt";
tb.Size = new System.Drawing.Size(184, 20);
myTabPage.Controls.Add(tb);
TextBox tb1 = new TextBox();
tb1.Location = new System.Drawing.Point(250, 120);
tb1.Name = "txt1";
tb1.Size = new System.Drawing.Size(184, 20);
myTabPage.Controls.Add(tb1);
TextBox tb2 = new TextBox();
tb2.Location = new System.Drawing.Point(250, 165);
tb2.Name = "txt2";
tb2.Size = new System.Drawing.Size(184, 20);
myTabPage.Controls.Add(tb2);
TextBox tb3 = new TextBox();
tb3.Location = new System.Drawing.Point(250, 210);
tb3.Name = "txt3";
tb3.Size = new System.Drawing.Size(184, 20);
myTabPage.Controls.Add(tb3);
//put data inside of textboxes
tb.Text = txtCoin.Text;
tb1.Text = txtYear.Text;
tb2.Text = txtGrade.Text;
tb3.Text = txtMint.Text;
// Add delete button
Button bn = new Button();
bn.Location = new System.Drawing.Point(560, 350);
bn.Name = "btnDelete";
bn.Text = "Delete";
bn.Size = new System.Drawing.Size(100, 50);
bn.Click += MyClick;
myTabPage.Controls.Add(bn);
}
private void MyClick(object sender, EventArgs e)
{
Form2 myform = new Form2();
myform.ShowDialog();
if (status == "yes")
{ tabControl1.TabPages.Remove(tabControl1.SelectedTab); }
status = "no";
}
private void btnExit_Click(object sender, EventArgs e)
{
this.Close();
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
int counter;
int ccounter;
string outLine;
string pathFileName = Path.Combine(Application.StartupPath, "coins.dat");
StreamWriter writeIt = new StreamWriter(pathFileName);
for (counter = 0; ((tabControl1.TabCount) -1) != 0 ;)
{
}
writeIt.Close();
}
}
}

Use a foreach loop instead of your for (counter = 0; ((tabControl1.TabCount) -1) != 0 ;) loop:
foreach (TabPage tabPage in tabControl.TabPages)

Your for loop is a infinite loop, do it like that:
for (counter = 0; counter < tabControl1.TabCount; counter++)
{
// Save the tab
}

Event won't fire in webpart lifecycle

I have a webpart that is quire simple. CLick on "Add" link that sets a 2 text boxes visible. Type in some text and click "Save" button but the click event won't fire. I'm pasting the code it hopes of some suggestion. I've searched for solutions but haven't found anything I can go on. I realize what maight be the issue but don't know how to corrct it. I need to be able to wireup and event with the handler sotimes before the page renders and I tried to override the OnPreRender method but it did not work in right moment.
Other minor issue that I will need to address is that the onFocus method doesn't work in txtMyLinkName.Focus(). Thanks for your help! - Risho
public class MyLinks : WebPart
{
public static string m_Portal = ConfigurationManager.ConnectionStrings["dbPortal"].ConnectionString;
Panel pnlMyLinks = new Panel();
Label lblError = new Label();
Label lblMyLinkURL = new Label();
Label lblMyLinkName = new Label();
TextBox txtMyLinkName = new TextBox();
TextBox txtMyLinkURL = new TextBox();
Button btnSaveMyLink = new Button();
LinkButton lbMyLinkAdd = new LinkButton();
Literal litP1 = new Literal();
Literal litBR1 = new Literal();
public cisf_MyLinks()
{
this.Title = "MyLinks";
this.ExportMode = WebPartExportMode.All;
}
protected override void CreateChildControls()
{
GetLinks();
base.CreateChildControls();
}
//protected override void OnPreRender(EventArgs e)
//{
// btnSaveMyLink.Text = "Save";
// btnSaveMyLink.Click += new EventHandler(btnSaveMyLink_Click);
// Controls.Add(btnSaveMyLink);
// base.OnPreRender(e);
//}
protected void GetLinks()
{
pnlMyLinks.Controls.Clear();
int i = 0;
lbMyLinkAdd.Text = "Add";
pnlMyLinks.Controls.Add(lbMyLinkAdd);
lbMyLinkAdd.Click += new EventHandler(lbMyLinkAdd_Click);
pnlMyLinks.Controls.Add(new LiteralControl("<br />"));
IDataReader drMyLinks = Get_MyLinks(Page.Request.ServerVariables["Logon_User"].Split("\\".ToCharArray())[1].ToLower());
while (drMyLinks.Read())
{
HyperLink hlMyLink = new HyperLink();
LinkButton lbDelMyLink = new LinkButton();
lbDelMyLink.Text = "(del)";
lbDelMyLink.ToolTip = "Delete this link";
lbDelMyLink.CssClass = "verytiny";
lbDelMyLink.Command += new CommandEventHandler(DelMyLink);
lbDelMyLink.CommandName = drMyLinks["id"].ToString();
pnlMyLinks.Controls.Add(lbDelMyLink);
pnlMyLinks.Controls.Add(new LiteralControl(" "));
hlMyLink.ID = "hl" + drMyLinks["ID"].ToString();
hlMyLink.Text = drMyLinks["Title"].ToString();
hlMyLink.NavigateUrl = drMyLinks["url"].ToString();
hlMyLink.Target = "_blank";
hlMyLink.ToolTip = drMyLinks["Title"].ToString();
pnlMyLinks.Controls.Add(hlMyLink);
pnlMyLinks.Controls.Add(new LiteralControl("<br />"));
if (drMyLinks["ID"].ToString() != "") { i += 1; }
}
this.Controls.Add(pnlMyLinks);
}
protected void lbMyLinkAdd_Click(object sender, EventArgs e)
{
lbMyLinkAdd.Visible = false;
lblMyLinkName.Visible = true;
txtMyLinkName.Visible = true;
litBR1.Visible = true;
lblMyLinkURL.Visible = true;
txtMyLinkURL.Visible = true;
btnSaveMyLink.Visible = true;
litP1.Visible = true;
(txtMyLinkName - dot focus)
lblMyLinkName.Text = "Link Name: ";
lblMyLinkURL.Text = "Link URL: ";
btnSaveMyLink.Text = "Save";
btnSaveMyLink.Click += new EventHandler(btnSaveMyLink_Click);
pnlMyLinks.Controls.Add(new LiteralControl("<table class='mylinksTable' cellpadding='0' cellspacing='0' border='1'><tr valign='top'><td>"));
pnlMyLinks.Controls.Add(lblMyLinkName);
pnlMyLinks.Controls.Add(new LiteralControl("</td><td>"));
pnlMyLinks.Controls.Add(txtMyLinkName);
pnlMyLinks.Controls.Add(new LiteralControl("</td></tr><tr valign='top'><td>"));
pnlMyLinks.Controls.Add(lblMyLinkURL);
pnlMyLinks.Controls.Add(new LiteralControl("</td><td>"));
pnlMyLinks.Controls.Add(txtMyLinkURL);
pnlMyLinks.Controls.Add(new LiteralControl("</td></tr><tr valign='top'><td colspan='2'>"));
pnlMyLinks.Controls.Add(btnSaveMyLink);
pnlMyLinks.Controls.Add(new LiteralControl("</td></tr></table>"));
this.Controls.Add(pnlMyLinks);
}
protected void btnSaveMyLink_Click(object sender, EventArgs e)
{
string thisURL;
if ((txtMyLinkName.Text != "") && (txtMyLinkURL.Text != ""))
{
if (txtMyLinkURL.Text.StartsWith("http"))
{ thisURL = txtMyLinkURL.Text; }
else { thisURL = "http://" + txtMyLinkURL.Text; }
AddMyLink(txtMyLinkName.Text, thisURL, Page.Request.ServerVariables["Logon_User"].Split("\\".ToCharArray())[1].ToLower());
GetLinks();
txtMyLinkName.Text = "";
txtMyLinkURL.Text = "";
lbMyLinkAdd.Visible = true;
}
lbMyLinkAdd.Visible = true;
lblMyLinkName.Visible = false;
txtMyLinkName.Visible = false;
litBR1.Visible = false;
lblMyLinkURL.Visible = false;
txtMyLinkURL.Visible = false;
btnSaveMyLink.Visible = false;
litP1.Visible = false;
}
}

If you are creating the button in code, then it needs to be wired up in the Page_Load event so that the click event can fire. Page_PreRender is too late.

In addition to adding the control in Load event as already posted, you should set the ID field e.g. btnSaveMyLink.ID = "SaveLink"; to a unique value.