Count lines in the TextBox and read text in TextBox line by line : TextBox « GUI Windows Forms « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. GUI Windows Forms
3. TextBox

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void showLinesButton_Click(object sender, EventArgs e)
    {
        StringBuilder lineInfo = new StringBuilder();
        lineInfo.Append("There are " + multiLineBox.Lines.Length.ToString() + " lines.\n");
        foreach (string line in multiLineBox.Lines)
        {
            lineInfo.Append(line + "\n");
        }

        MessageBox.Show(lineInfo.ToString());
    }
}
partial class Form1
{
    private void InitializeComponent()
    {
        this.multiLineBox = new System.Windows.Forms.TextBox();
        this.showLinesButton = new System.Windows.Forms.Button();
        this.SuspendLayout();
        // 
        // multiLineBox
        // 
        this.multiLineBox.Location = new System.Drawing.Point(12, 12);
        this.multiLineBox.Multiline = true;
        this.multiLineBox.Name = "multiLineBox";
        this.multiLineBox.Size = new System.Drawing.Size(268, 213);
        this.multiLineBox.TabIndex = 0;
        // 
        // showLinesButton
        // 
        this.showLinesButton.Location = new System.Drawing.Point(205, 231);
        this.showLinesButton.Name = "showLinesButton";
        this.showLinesButton.Size = new System.Drawing.Size(75, 23);
        this.showLinesButton.TabIndex = 1;
        this.showLinesButton.Text = "Show Lines";
        this.showLinesButton.Click += new System.EventHandler(this.showLinesButton_Click);
        // 
        // Form1
        // 
        this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
        this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
        this.ClientSize = new System.Drawing.Size(292, 266);
        this.Controls.Add(this.showLinesButton);
        this.Controls.Add(this.multiLineBox);
        this.Name = "Form1";
        this.Text = "Form1";
        this.ResumeLayout(false);
        this.PerformLayout();

    }

    private System.Windows.Forms.TextBox multiLineBox;
    private System.Windows.Forms.Button showLinesButton;
}
public class TextBoxLineCountText
{
    [STAThread]
    static void Main()
    {
        Application.EnableVisualStyles();
        Application.Run(new Form1());
    }
}

23.17.TextBox
	23.17.1.	Get input value from TextBox and display it vis a messagebox
	23.17.2.	TextBox key pressed event
	23.17.3.	TextBox Modified and TextChanged
	23.17.4.	TextBox: Multiline and BorderStyle
	23.17.5.	TextBox Keyevent hander
	23.17.6.	TextBox cancel event
	23.17.7.	Count lines in the TextBox and read text in TextBox line by line
	23.17.8.	TextBox selection
	23.17.9.	TextBox validation
	23.17.10.	Add ContextMenu to TextBox
	23.17.11.	Use Regular Expression to Check the input for a TextBox
	23.17.12.	Multiline TextBox
	23.17.13.	Simple Editor