右键点击行时选中行，并弹出操作菜单
1). 添加一个快捷菜单contextMenuStrip1；
2). 给dataGridView1的CellMouseDown事件添加处理程序：
private void DataGridView1_CellMouseDown(object sender, DataGridViewCellMouseEventArgs e)
{
     if (e.Button == MouseButtons.Right)
     {
         if (e.RowIndex >= 0)
         {
             //若行已是选中状态就不再进行设置
             if (dataGridView1.Rows[e.RowIndex].Selected == false)
             {
                 dataGridView1.ClearSelection();
                 dataGridView1.Rows[e.RowIndex].Selected = true;
             }
             //只选中一行时设置活动单元格
             if (dataGridView1.SelectedRows.Count == 1)
             {
                 dataGridView1.CurrentCell = dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex];
             }
             //弹出操作菜单
             contextMenuStrip1.Show(MousePosition.X, MousePosition.Y);
         }
     }
}
效果图：

2).复制选中单元格的内容到剪贴板
Clipboard.SetDataObject(dataGridView1.GetClipboardContent());
3).只显示自定义列
dataGridView1.AutoGenerateColumns = false;//必须在代码中设置
4).显示图片
通常，我们将图片路径保存在数据库中，但在dataGridView1中要显示图片，可以进行如下操作：
①.添加一个DataGridViewTextBoxColumn类型的列，Name=Path,DataPropertyName=Pic,Visible=False；
②.添加一个DataGridViewImageColumn类型的列，Name=Pic；
③.dataGridView1控件DataBindingComplete事件处理程序如下：
private void DataGridView1_DataBindingComplete(object sender, DataGridViewBindingCompleteEventArgs e)
{
     Image image1 = null;
     Image image2 = null;
     string path = string.Empty;
     for (int i = 0; i < dataGridView1.Rows.Count; i++)
     {
         path = @"F:\" + dataGridView1.Rows[i].Cells["Path"].Value;
         if (File.Exists(path))
         {
             image1 = Image.FromFile(path);
             image2 = new Bitmap(image1, 120, 120);//重设大小
             dataGridView1.Rows[i].Cells["Pic"].Value = image2;
             //((DataGridViewImageCell)dataGridView1.Rows[i].Cells["Pic"]).Value = image2;
         }
     }
}
5).当网格未填充满控件时，画线来填充空白区域
/// <summary>
/// 绘制网格填充空白区域
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
public void CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
{
     DataGridView myDataGridView = (DataGridView)sender;
     if (myDataGridView.Rows.Count > 0)
     {
         int i = myDataGridView.ColumnHeadersHeight;//标题行高
         int j = myDataGridView.Rows.GetRowsHeight(DataGridViewElementStates.Visible); //所有可见行总高
         int k = myDataGridView.Height; //控件高度
         int l = myDataGridView.Rows.GetLastRow(DataGridViewElementStates.Visible);//最后一行索引
         int count = myDataGridView.Columns.Count;//列总数
         int width = 0;
         //当网格未充满控件时才画线
         if (i + j < k)
         {
             using (Brush gridBrush = new SolidBrush(myDataGridView.GridColor))
             {
                 using (Pen gridLinePen = new Pen(gridBrush))
                 {
                     //处理标题列
                     if (myDataGridView.RowHeadersVisible)
                     {
                         width = myDataGridView.RowHeadersWidth;
                         e.Graphics.DrawLine(gridLinePen, width, i + j, width, k);
                     }
                     else
                     {
                         width = 1;
                     }
                     //处理正常列
                     for (int index = 0; index < count; index++)
                     {
                         if (myDataGridView.Columns[index].Visible)
                         {
                             width += myDataGridView.Columns[index].Width;
                             e.Graphics.DrawLine(gridLinePen, width, i + j, width, k);
                         }
                     }
                 }
             }
         }
     }
}
6).自定义列宽
手动添加列，再在编辑列界面中逐个设置宽度。注意AutoSizeColumnsMode的值必须为DataGridViewAutoSizeColumnsMode.None，否则自定义宽度不能生效！
7).单元格内容格式化
private void dataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
     DataGridView myDataGridView = (DataGridView)sender;
     if (myDataGridView.Columns["ID"].Index == e.ColumnIndex)
     {
         if(e.Value != null && !string.IsNullOrEmpty(e.Value.ToString()))
             e.Value = "BH" + string.Format("{0:D8}", int.Parse(e.Value.ToString()));
     }
}
8).打造一个漂亮的DataGridView
//样式
dataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.None;//列宽不自动调整,手工添加列
dataGridView1.RowHeadersWidth = 12;//行标题宽度固定12
dataGridView1.RowHeadersWidthSizeMode = DataGridViewRowHeadersWidthSizeMode.DisableResizing;//不能用鼠标调整列标头宽度
dataGridView1.AlternatingRowsDefaultCellStyle.BackColor = Color.LemonChiffon;//奇数行背景色
dataGridView1.BackgroundColor = Color.White;//控件背景色
dataGridView1.ColumnHeadersDefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter;//列标题居中显示
dataGridView1.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter;//单元格内容居中显示
//行为
dataGridView1.AutoGenerateColumns = false;//不自动创建列
dataGridView1.AllowUserToAddRows = false;//不启用添加
dataGridView1.ReadOnly = true;//不启用编辑
dataGridView1.AllowUserToDeleteRows = false;//不启用删除
dataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect;//单击单元格选中整行
dataGridView1.MultiSelect = false;//不能多选
9).判断有无滚动条
//垂直滚动条
if (dataGridView1.Rows.GetRowsHeight(DataGridViewElementStates.None) > dataGridView1.Height)
     MessageBox.Show("有");
else
     MessageBox.Show("无");
//水平滚动条
if(dataGridView1.Columns.GetColumnsWidth(DataGridViewElementStates.None) > dataGridView1.Width)
     MessageBox.Show("有");
else
     MessageBox.Show("无");
10).为什么列标题总不居中？
已经将列标题默认对齐方式设置为居中：
dataGridView1.ColumnHeadersDefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter;//列标题居中显示
但实际的效果总是偏左了一点，原因是列可以进行排序，排序标志符号在列标题上占了空间。逐列按下边设置可去掉：
dataGridView1.Columns[i].SortMode = DataGridViewColumnSortMode.NotSortable

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