How to dynamically resize a textbox in C#

Question

I am new to C# user interface. I have created a window as shown in the first image. But if the user drag the window and make it bigger, I would like for it to make each richTextBox expand with it as shown in the second image. For example, make the richTextBox4 bigger proportional to the size of the window. Any ideas would be greatly appreciated

Image1:

Image 2:

Answer 1

You can add a TableLayoutPanel to your Form. Per default this panel has two columns and two rows.

Then you add one TextBox to each cell and set the Dock -Property of each TextBox to Fill .

The last step thing to do is either set the Dock -Property of your TableLayoutPanel to Fill or set the Anchor -Property of your TableLayoutPanel to Left | Right | Bottom | Top Left | Right | Bottom | Top Left | Right | Bottom | Top . Then your panel will be resized together with the Form.

All these steps can be done with the designer.

Answer 2

Make use of TableLayoutControl . You can have one control per cell of that table. Now, on that table, you set:

Dock: Fill
Column Width: Percentage or absolute value as per needs
Row Height: Percentage or absolute value as per needs

On the controls, like textboxes in your case, set Dock to Fill .

Read about it and try. If you get stuck, do come back with questions.

Answer 3

通过将TableLayoutControl与每个单元格中的一个文本框一起使用，然后将每个控件的锚点属性（文本框和TableLayout）设置为Left，Top，Right和bottom，可以实现相同的结果。

Answer 4

You can do it in designer.

Use the TableLayoutPanel , and set its Anchor property to Top , Bottom , Left , Right and for each RichtTextBox inside the cells set Dock to Fill .

this.tableLayoutPanel1 = new System.Windows.Forms.TableLayoutPanel();
        this.button1 = new System.Windows.Forms.Button();
        this.richTextBox1 = new System.Windows.Forms.RichTextBox();
        this.richTextBox2 = new System.Windows.Forms.RichTextBox();
        this.richTextBox3 = new System.Windows.Forms.RichTextBox();
        this.richTextBox4 = new System.Windows.Forms.RichTextBox();
        this.tableLayoutPanel1.SuspendLayout();
        this.SuspendLayout();
        // 
        // tableLayoutPanel1
        // 
        this.tableLayoutPanel1.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom) 
        | System.Windows.Forms.AnchorStyles.Left) 
        | System.Windows.Forms.AnchorStyles.Right)));
        this.tableLayoutPanel1.ColumnCount = 2;
        this.tableLayoutPanel1.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle(System.Windows.Forms.SizeType.Percent, 50F)); //this line sets the Column percentage
        this.tableLayoutPanel1.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle(System.Windows.Forms.SizeType.Percent, 50F));
        this.tableLayoutPanel1.Controls.Add(this.richTextBox4, 1, 1);
        this.tableLayoutPanel1.Controls.Add(this.richTextBox3, 0, 1);
        this.tableLayoutPanel1.Controls.Add(this.richTextBox2, 1, 0);
        this.tableLayoutPanel1.Controls.Add(this.richTextBox1, 0, 0);
        this.tableLayoutPanel1.Location = new System.Drawing.Point(24, 80);
        this.tableLayoutPanel1.Name = "tableLayoutPanel1";
        this.tableLayoutPanel1.RowCount = 2;
        this.tableLayoutPanel1.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Percent, 50F));
        this.tableLayoutPanel1.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Percent, 50F));
        this.tableLayoutPanel1.Size = new System.Drawing.Size(861, 567);
        this.tableLayoutPanel1.TabIndex = 0;
        // 
        // button1
        // 
        this.button1.Location = new System.Drawing.Point(24, 27);
        this.button1.Name = "button1";
        this.button1.Size = new System.Drawing.Size(137, 47);
        this.button1.TabIndex = 0;
        this.button1.Text = "button1";
        this.button1.UseVisualStyleBackColor = true;
        this.button1.Click += new System.EventHandler(this.button1_Click);
        // 
        // richTextBox1
        // 
        this.richTextBox1.Dock = System.Windows.Forms.DockStyle.Fill;
        this.richTextBox1.Location = new System.Drawing.Point(3, 3);
        this.richTextBox1.Name = "richTextBox1";
        this.richTextBox1.Size = new System.Drawing.Size(424, 277);
        this.richTextBox1.TabIndex = 0;
        this.richTextBox1.Text = "";
        // 
        // richTextBox2
        // 
        this.richTextBox2.Dock = System.Windows.Forms.DockStyle.Fill;
        this.richTextBox2.Location = new System.Drawing.Point(433, 3);
        this.richTextBox2.Name = "richTextBox2";
        this.richTextBox2.Size = new System.Drawing.Size(425, 277);
        this.richTextBox2.TabIndex = 1;
        this.richTextBox2.Text = "";
        // 
        // richTextBox3
        // 
        this.richTextBox3.Dock = System.Windows.Forms.DockStyle.Fill;
        this.richTextBox3.Location = new System.Drawing.Point(3, 286);
        this.richTextBox3.Name = "richTextBox3";
        this.richTextBox3.Size = new System.Drawing.Size(424, 278);
        this.richTextBox3.TabIndex = 2;
        this.richTextBox3.Text = "";
        // 
        // richTextBox4
        // 
        this.richTextBox4.Dock = System.Windows.Forms.DockStyle.Fill;
        this.richTextBox4.Location = new System.Drawing.Point(433, 286);
        this.richTextBox4.Name = "richTextBox4";
        this.richTextBox4.Size = new System.Drawing.Size(425, 278);
        this.richTextBox4.TabIndex = 3;
        this.richTextBox4.Text = "";
        // 
        // Form1
        // 
        this.AutoScaleDimensions = new System.Drawing.SizeF(12F, 25F);
        this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
        this.ClientSize = new System.Drawing.Size(922, 659);
        this.Controls.Add(this.button1);
        this.Controls.Add(this.tableLayoutPanel1);
        this.Name = "Form1";
        this.Text = "Form1";
        this.tableLayoutPanel1.ResumeLayout(false);
        this.ResumeLayout(false);