Pls. help me create control at runtime

Question

I'm just a beginner and i want to design a simple windows application that can create control during runtime. I have this simple code here that can add a label control during runtime. When i click the button its ok the label as added and shown in the form but the second time i click the button the label is created but it won't display on the form. Can you help me solve this problem? And I also want to know how to create the Method that creates control in another class. using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; namespace DynamicControls { /// /// Summary description for Form1. /// public class Form1 : System.Windows.Forms.Form { private System.Windows.Forms.Button button1; private int xloc; private int yloc; private int iTabIndex; private string strName; private int lblNum; /// /// Required designer variable. /// private System.ComponentModel.Container components = null; public Form1() { // // Required for Windows Form Designer support // InitializeComponent(); // // TODO: Add any constructor code after InitializeComponent call // xloc = 48; yloc = 8; iTabIndex = 1; strName = 'Label'; lblNum = 1; } /// /// Clean up any resources being used. /// protected override void Dispose( bool disposing ) { if( disposing ) { if (components != null) { components.Dispose(); } } base.Dispose( disposing ); } #region Windows Form Designer generated code /// /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// private void InitializeComponent() { this.button1 = new System.Windows.Forms.Button(); this.SuspendLayout(); // // button1 // this.button1.Location = new System.Drawing.Point(16, 312); this.button1.Name = 'button1'; this.button1.TabIndex = 0; this.button1.Text = 'Add'; this.button1.Click += new System.EventHandler(this.button1_Click); // // Form1 // this.AutoScaleBaseSize = new System.Drawing.Size(5, 13); this.ClientSize = new System.Drawing.Size(292, 341); this.Controls.Add(this.button1); this.Name = 'Form1'; this.Text = 'Form1'; this.ResumeLayout(false); } #endregion /// /// The main entry point for the application. /// [STAThread] static void Main() { Application.Run(new Form1()); } private void button1_Click(object sender, System.EventArgs e) { CreateNewLabel(); } public void CreateNewLabel() { System.Windows.Forms.Label lblTemp = new System.Windows.Forms.Label(); lblTemp.Location = new System.Drawing.Point(xloc,yloc); lblTemp.Name = strName + lblNum.ToString(); lblTemp.TabIndex = iTabIndex; lblTemp.Text = strName + lblNum.ToString(); Controls.Add(lblTemp); if(lblTemp.Created) MessageBox.Show('Label Created!!!'); else MessageBox.Show('Label not Created!!!'); iTabIndex++; lblNum++; yloc = yloc + 10; xloc = xloc + 10; } } }

S_Kiryazov · Answer

You just have to do the following: Button button = new Button(); button.Click += new EventHandler( SomeFunction ); You can tell exactly which button was clicked by the Name property like this switch( ((Button)sender).Name ) { case "button1": .... }

Andrei Arugay · Answer

I mean this. You have a method created a method during design time that will create a series of button when the application is running. Now a series of button controls is made at runtime. Of course you didn't create the button during design time but it has a click event for example in every buttons. You have SomeFunction() method for example during design time. What do i want to know is that how will you put that SomeFunction() method in the click event of a button that was created during runtime at the moment you click at that button because you didn't make a click event of a button during design time?

Andrei Arugay · Answer

I mean this. A series of button controls is made at runtime. Of course you didn't create the button during design time and of course it has a click event for example in every buttons. You have SomeFunction() method for example during design time. What do i want to know is that how will you put that SomeFunction() method in the click event of a button that was created during runtime because you didn't make a click event of a button during design time?

Mykonine · Answer

Do it the same way you did with the labels. I recommend that you do more reading on the following topics: C# language stuff: 1. Events and delegates 2. Event handling through attached delegates 3. Inheritance 4. Interfaces And then take a flip through the MSDN documentation on the System.Windows.Forms namespace. With that knowledge you should have a much easier time understanding how forms work.

Andrei Arugay · Answer

Pls. Disregard the question i hav posted. I just forgot to increase the position(y-position) of the control created. I change my question, "How to create a button and textbox control during runtime? How to access the event handlers of button and textbox created? And, How to create the code outside from the form class, i.e. create the code for adding runtime controls in another class or namespace?

Andrei Arugay · Answer

Pls. Disregard the question i hav posted. I just forgot to increase the position(y-position) of the control created. I change my question, "How to create a button and textbox control during runtime? How to access the event handlers of button and textbox? And, How to create the code outside from the form class, i.e. create the code for adding runtime controls in another class or namespace?

Pls. help me create control at runtime

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Answers (6)