How to Add ToolTips to Individual Cells in a Windows Forms DataGridView

// Sets the ToolTip text for cells in the Rating column.
void dataGridView1_CellFormatting(object sender, 
DataGridViewCellFormattingEventArgs e)
{
if ( (e.ColumnIndex == this.dataGridView1.Columns["Rating"].Index)
&& e.Value != null )
{
DataGridViewCell cell = 
this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex];
if (e.Value.Equals("*"))
{                
cell.ToolTipText = "very bad";
}
else if (e.Value.Equals("**"))
{
cell.ToolTipText = "bad";
}
else if (e.Value.Equals("***"))
{
cell.ToolTipText = "good";
}
else if (e.Value.Equals("****"))
{
cell.ToolTipText = "very good";
}
}
}


More Understanding Refer This : http://msdn.microsoft.com/en-us/library/2249cf0a.aspx#Y0