调试易

    public Form1()
        {
            // 
            // Required for Windows Form Designer support 
            // 
            int[,] ax = new int[2, 2] { { 1, 2 }, { 3, 4 } };
            InitializeComponent();
            int[,] ax1 = new int[2, 2] { { 1, 2 }, { 3, 4 } };
            // 
            // TODO: Add any constructor code after InitializeComponent call 
            // 
            System.Collections.Hashtable abc = new Hashtable();
        }        /// <summary> 
        /// Clean up any resources being used. 
        /// </summary> 
        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                if (components != null)
                {
                    components.Dispose();
                }
            }
            base.Dispose(disposing);
        }        #region Windows Form Designer generated code
        /// <summary> 
        /// Required method for Designer support - do not modify 
        /// the contents of this method with the code editor. 
        /// </summary> 
        private void InitializeComponent()
        {
            System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Form1));
            this.按钮_黑名单 = new System.Windows.Forms.Button();
            this.按钮_陌生人 = new System.Windows.Forms.Button();
            this.groupBox1 = new System.Windows.Forms.GroupBox();
            this.按钮_我的好友 = new System.Windows.Forms.Button();
            this.pictureBox1 = new System.Windows.Forms.PictureBox();
            this.pictureBox2 = new System.Windows.Forms.PictureBox();
            this.pictureBox3 = new System.Windows.Forms.PictureBox();
            this.button1 = new System.Windows.Forms.Button();
            this.groupBox1.SuspendLayout();
            this.SuspendLayout();
            // 
            // 按钮_黑名单 
            // 
            this.按钮_黑名单.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left)
             | System.Windows.Forms.AnchorStyles.Right)));
            this.按钮_黑名单.BackColor = System.Drawing.Color.FromArgb(((System.Byte)(255)), ((System.Byte)(255)), ((System.Byte)(192)));
            this.按钮_黑名单.Location = new System.Drawing.Point(0, 56);
            this.按钮_黑名单.Name = "按钮_黑名单";
            this.按钮_黑名单.Size = new System.Drawing.Size(97, 27);
            this.按钮_黑名单.TabIndex = 2;
            this.按钮_黑名单.Text = "黑 名 单";
            this.按钮_黑名单.Click += new System.EventHandler(this.按钮_黑名单_单击);
            // 
            // 按钮_陌生人 
            // 
           

 this.按钮_陌生人.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left)
             | System.Windows.Forms.AnchorStyles.Right)));
            this.按钮_陌生人.BackColor = System.Drawing.Color.FromArgb(((System.Byte)(255)), ((System.Byte)(255)), ((System.Byte)(192)));
            this.按钮_陌生人.Location = new System.Drawing.Point(0, 28);
            this.按钮_陌生人.Name = "按钮_陌生人";
            this.按钮_陌生人.Size = new System.Drawing.Size(97, 28);
            this.按钮_陌生人.TabIndex = 1;
            this.按钮_陌生人.Text = "陌 生 人";
            this.按钮_陌生人.Click += new System.EventHandler(this.按钮_陌生人_单击);
            // 
            // groupBox1 
            // 
            this.groupBox1.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left)
             | System.Windows.Forms.AnchorStyles.Right)));
            this.groupBox1.BackColor = System.Drawing.Color.FromArgb(((System.Byte)(128)), ((System.Byte)(128)), ((System.Byte)(255)));
            this.groupBox1.Controls.Add(this.按钮_黑名单);
            this.groupBox1.Controls.Add(this.按钮_陌生人);
            this.groupBox1.Controls.Add(this.按钮_我的好友);
            this.groupBox1.FlatStyle = System.Windows.Forms.FlatStyle.Popup;
            this.groupBox1.Location = new System.Drawing.Point(0, 22);
            this.groupBox1.Name = "groupBox1";
            this.groupBox1.Size = new System.Drawing.Size(97, 360);
            this.groupBox1.TabIndex = 0;
            this.groupBox1.TabStop = false;
            this.groupBox1.Enter += new System.EventHandler(this.groupBox1_Enter);
            // 
            // 按钮_我的好友 
            // 
            this.按钮_我的好友.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left)
             | System.Windows.Forms.AnchorStyles.Right)));
            this.按钮_我的好友.BackColor = System.Drawing.Color.FromArgb(((System.Byte)(255)), ((System.Byte)(255)), ((System.Byte)(192)));
            this.按钮_我的好友.Location = new System.Drawing.Point(0, 1);
            this.按钮_我的好友.Name = "按钮_我的好友";
            this.按钮_我的好友.Size = new System.Drawing.Size(97, 28);
            this.按钮_我的好友.TabIndex = 0;
            this.按钮_我的好友.Text = "我 的 好 友";
            this.按钮_我的好友.Click += new System.EventHandler(this.按钮_我的好友_单击);
            // 
            // pictureBox1 
            // 
            this.pictureBox1.Image = ((System.Drawing.Image)(resources.GetObject("pictureBox1.Image")));
            this.pictureBox1.Location = new System.Drawing.Point(11, 2);
            this.pictureBox1.Name = "pictureBox1";
            this.pictureBox1.Size = new System.Drawing.Size(28, 19);
            this.pictureBox1.TabIndex = 1;
            this.pictureBox1.TabStop = false;
            // 
            // pictureBox2 
            // 
            this.pictureBox2.Image = ((System.Drawing.Image)(resources.GetObject("pictureBox2.Image")));
            this.pictureBox2.Location = new System.Drawing.Point(39, 2);
            this.pictureBox2.Name = "pictureBox2";
            this.pictureBox2.Size = new System.Drawing.Size(20, 21);
            this.pictureBox2.TabIndex = 2;
            this.pictureBox2.TabStop = false;
            // 
            // pictureBox3 
            // 
            this.pictureBox3.Image = ((System.Drawing.Image)(resources.GetObject("pictureBox3.Image")));
            this.pictureBox3.Location = new System.Drawing.Point(70, 2);
            this.pictureBox3.Name = "pictureBox3";
            this.pictureBox3.Size = new System.Drawing.Size(25, 19);
            this.pictureBox3.TabIndex = 3;
            this.pictureBox3.TabStop = false;
            // 
            // button1 
            // 
            this.button1.BackColor = System.Drawing.SystemColors.Info;
            this.button1.Location = new System.Drawing.Point(4, 384);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(100, 25);
            this.button1.TabIndex = 4;
            this.button1.Text = "显示对话窗口";
            this.button1.Click += new System.EventHandler(this.button1_Click);
            // 
            // Form1 
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
            this.BackColor = System.Drawing.SystemColors.ActiveCaption;
            this.ClientSize = new System.Drawing.Size(97, 408);
            this.Controls.Add(this.button1);
            this.Controls.Add(this.pictureBox3);
            this.Controls.Add(this.pictureBox2);
            this.Controls.Add(this.pictureBox1);
            this.Controls.Add(this.groupBox1);
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
            this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));
            this.MaximizeBox = false;
            this.MinimizeBox = false;
            this.Name = "Form1";
            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
            this.Text = "QQ2008";
            this.Load += new System.EventHandler(this.Form1_Load);
            this.groupBox1.ResumeLayout(false);
            this.ResumeLayout(false);        }
        #endregion        /// <summary> 
        /// The main entry point for the application. 
        /// </summary> 
        [STAThread]
        static void Main()
        {
            Application.Run(new Form1());
        }        private void 按钮_我的好友_单击(object sender, System.EventArgs e)
        {
            陌生人++;
        }        private void 按钮_陌生人_单击(object sender, System.EventArgs e)
        {
            陌生人--;
            黑名单++;
        }        private void 按钮_黑名单_单击(object sender, System.EventArgs e)
        {
            陌生人--;
            黑名单--;
        }        private void groupBox1_Enter(object sender, System.EventArgs e)
        {        }        private void button1_Click(object sender, System.EventArgs e)
        {
            Form2 dg = new Form2();
            dg.Show();
        }        private void Form1_Load(object sender, System.EventArgs e)
        {        }
    }
}

------ 已启动全部重新生成: 项目: test001, 配置: Debug Any CPU ------
C:\Windows\Microsoft.NET\Framework\v3.5\Csc.exe /noconfig /nowarn:1701,1702 /errorreport:prompt /warn:4 /define:DEBUG;TRACE /reference:"C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.5\System.Core.dll" /reference:"C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.5\System.Data.DataSetExtensions.dll" /reference:C:\Windows\Microsoft.NET\Framework\v2.0.50727\System.Data.dll /reference:C:\Windows\Microsoft.NET\Framework\v2.0.50727\System.Deployment.dll /reference:C:\Windows\Microsoft.NET\Framework\v2.0.50727\System.dll /reference:C:\Windows\Microsoft.NET\Framework\v2.0.50727\System.Drawing.dll /reference:C:\Windows\Microsoft.NET\Framework\v2.0.50727\System.Windows.Forms.dll /reference:C:\Windows\Microsoft.NET\Framework\v2.0.50727\System.Xml.dll /reference:"C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.5\System.Xml.Linq.dll" /debug+ /debug:full /filealign:512 /optimize- /out:obj\Debug\test001.exe /resource:obj\Debug\test001.Properties.Resources.resources /target:winexe Form1.cs Form1.Designer.cs Program.cs Properties\AssemblyInfo.cs Properties\Resources.Designer.cs Properties\Settings.Designer.cs
C:\Users\SONGS\Documents\Visual Studio 2008\Projects\test001\test001\Program.cs(291,13): 错误 CS0246: 找不到类型或命名空间名称“Form2”(是否缺少 using 指令或程序集引用?)
C:\Users\SONGS\Documents\Visual Studio 2008\Projects\test001\test001\Program.cs(291,28): 错误 CS0246: 找不到类型或命名空间名称“Form2”(是否缺少 using 指令或程序集引用?)编译完成 -- 2 个错误，0 个警告
========== 全部重新生成: 成功 0 个，失败 1 个，跳过 0 个 ==========

是不是你把FORM2删除了, 但是没有删除PROGRAM.CS的关于FORM2的代码?(自动生成的关于FORM2的代码)

检查你的项目里面、或者你项目所引用的你自己开发的Class Library里面有没有Form2？

我的Form1还有，可也出现了这样的问题

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;using System.Drawing.Drawing2D;namespace 算法实现_图
{
    public partial class Form1 : Form
    {
        const int n = 20;
        TextBox[] textBox = new TextBox[n];
        TextBox[,] textBox_1 = new TextBox[n, n];
        Label label;
        int i, j;
        bool  = true;
        string[] s = new string[n];        public Form1()
        {
            InitializeComponent();
        }
        private void set_textBox(TextBox textBox, int p, int q)
        {
            textBox = new TextBox();
            textBox.Name = "textBox";
            textBox.Visible = true;
            textBox.Width = 21;
            textBox.Height = 26;
            textBox.Text = "";
            this.Controls.Add(textBox);
            textBox.Location = new Point(p, q);
            textBox.Font = new Font("Arial", 12);
        }        private void set_grouptextBox(TextBox textBox1, TextBox textBox2, TextBox textBox3, int p, int q)
        {
            set_textBox(textBox1, p, q);
            set_textBox(textBox2, p + 24, q);
            set_textBox(textBox3, p + 48, q);
        }        private void set_label()
        {
            label = new Label();
            label.Name = "label";
            label.Text = "";
            label.Visible = true;
            label.AutoSize = true;
            label.Font = new Font("幼圆", 12);
            this.Controls.Add(label);
            label.Location = new Point(1, 20);
        }        private void radioButton1_CheckedChanged(object sender, EventArgs e)
        {            if (radioButton1.Checked)
            {
                radioButton1.Visible = radioButton2.Visible = label1.Visible = false;
                label2.Text = "您要建立的有向图的顶点数和边数分别为：";
                label2.Font = new Font("微软雅黑", 12);
                label2.Visible = textBox1.Visible = textBox2.Visible = button1.Visible = true;
            }
        }        private void radioButton2_CheckedChanged(object sender, EventArgs e)
        {
            if (radioButton2.Checked)
            {
                radioButton1.Visible = radioButton2.Visible = label1.Visible = false;
                label2.Text = "您要建立的无向图的定点数和边数分别为：";
                label2.Font = new Font("微软雅黑", 12);
                label2.Visible = textBox1.Visible = textBox2.Visible = button1.Visible = true;
            }
        }        private void button1_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == "" || textBox2.Text == "")
            {
                if (textBox1.Text == "" && textBox2.Text == "")
                    MessageBox.Show(this, "请输入顶点数和边数！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
                if (textBox1.Text == "" && textBox2.Text != "")
                    MessageBox.Show(this, "请输入顶点数！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
                if (textBox1.Text != "" && textBox2.Text == "")
                    MessageBox.Show(this, "请输入边数！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }            else
            {
                button2.Visible = true;
                if (radioButton1.Checked)
                {
                    label2.Visible = textBox1.Visible = textBox2.Visible = button1.Visible = false;
                    set_label();
                    label.Text = "请输入您要建立的有向图的各个顶点的数据域值：";
                    for (i = 0; i < Convert.ToSingle(textBox1.Text); i++)
                    {
                        set_textBox(textBox[i], 150 + 30 * i, 50);
                    }
                }                if (radioButton2.Checked)
                {
                    label2.Visible = textBox1.Visible = textBox2.Visible = button1.Visible = false;
                    set_label();
                    label.Text = "请输入您要建立的无向图的各个顶点的数据域值：";
                    for (i = 0; i < Convert.ToSingle(textBox1.Text); i++)
                    {
                        set_textBox(textBox[i], 150 + 30 * i, 50);
                    }
                }
            }
        }        private void get_text(string[] s1)
        {
            for (i = 0; i < Convert.ToSingle(textBox1.Text); i++)
            {
                TextBox text = new TextBox();
                text = textBox[i];
                s1[i] = Convert.ToString(text.Text);
            }
        }        private void button2_Click(object sender, EventArgs e)
        {
            get_text(s);
            for (i = 0; i < Convert.ToSingle(textBox1.Text); i++)
            {
                if (s[i] == "")
                {
                     = false;
                    break;
                }
            }            while ( == false)
            {
                get_text(s);
                for (i = 0; i < Convert.ToSingle(textBox1.Text); i++)
                {
                    if (s[i] == "")
                    {
                        MessageBox.Show(this, "还有未输入的顶点域值", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                        break;
                    }
                    else
                         = true;
                }
            }            set_label();
            label.Text = "请输入您要建立的图的各个边\\（v1,v2,w）：";
            label.Location = new Point(1, 150);
            for (i = 0; i < Convert.ToSingle(textBox2.Text); i++)
            {
                set_grouptextBox(textBox_1[i, 0], textBox_1[i, 1], textBox_1[i, 2], 230, 180 + 30 * i);
            }
            button3.Visible = true;
            button3.Location = new Point(235, 180 + 30 * Convert.ToInt16(textBox2.Text));
        }
    }
}
错误 1 未能找到类型或命名空间名称“Form1”(是否缺少 using 指令或程序集引用?) F:\课程设计作业\数据结构\WindowsFormsApplication2\WindowsFormsApplication2\Program.cs 18