1.为每一个单元格制定一个tooptip提示，当鼠标移到单元格时，自动弹出提示框。

界面如下：

 

 

1，代码如下，

   先设置鼠标移到单元格的行号和列号：

public partial class DataGridViewMerge : Form{         private int CellColumnIndex { get; set; }        private int CellRowIndex { get; set; }}

　　

设置鼠标进入单元格显示tooltip工具窗口。

如下：

private void dgv1_CellMouseEnter(object sender, DataGridViewCellEventArgs e)         {             if (e.RowIndex < 0 || e.ColumnIndex < 0)             {                 return;             }                         this.toolTip1.Hide(this.dgv1);              this.CellColumnIndex = e.ColumnIndex;             this.CellRowIndex = e.RowIndex;             if (this.CellColumnIndex >= 0 && this.CellRowIndex >= 0)             {               int dgvY = dgv1.Location.Y;                 int dgvX = dgv1.Location.X;                 int cellX = dgv1.GetCellDisplayRectangle(CellColumnIndex,CellRowIndex,false).X;                 int cellY = dgv1.GetCellDisplayRectangle(CellColumnIndex,CellRowIndex,false).Y;                 int x = dgvX + cellX;                 int y = dgvY + cellY+5;                  DataGridViewCell dgvc = this.dgv1[this.CellColumnIndex, this.CellRowIndex];                // Point mousePos = PointToClient(MousePosition);                 Point mousePos = new Point(x, y);                  Rectangle rec = dgvc.ContentBounds;                 string tip = "Tip is " + dgvc.Value.ToString()+" "+x+" "+y;                   this.toolTip1.Show(tip, this.dgv1, mousePos);                               }                       }

　　

 鼠标离开单元格时，隐藏tooltip

代码如下：

private void dgv1_CellMouseLeave(object sender, DataGridViewCellEventArgs e){        this.toolTip1.Hide(this.dgv1);}