///DataGridView 的某一列的数据显示为“*”。---DataGridView中设置密码列（显示为*号）
///把第4列设置为密码列（显示为*号）：

///<summary>
///单元格显示格式事件
///</summary>
///<paramname="sender"></param>
///<paramname="e"></param>
privatevoiddataGridView1_CellFormatting(objectsender,DataGridViewCellFormattingEventArgse)
{
//把第4列显示*号，*号的个数和实际数据的长度相同
if(e.ColumnIndex==3)
{
if(e.Value!=null&&e.Value.ToString().Length>0)
{
e.Value=newstring('*',e.Value.ToString().Length);
}
}
}

///<summary>
///编辑单元格控件事件
///</summary>
///<paramname="sender"></param>
///<paramname="e"></param>
privatevoiddataGridView1_EditingControlShowing(objectsender,DataGridViewEditingControlShowingEventArgse)
{
//编辑第4列时，把第4列显示为*号
TextBoxt=e.ControlasTextBox;
if(t!=null)
{
if(this.dataGridView1.CurrentCell.ColumnIndex==3)
t.PasswordChar='*';
else
t.PasswordChar=newchar();
}
}

'vb.net code:

Private Sub DataGridView1_CellFormatting(ByVal sender As Object,ByVal e As System.Windows.Forms.DataGridViewCellFormattingEventArgs) Handles DataGridView1.CellFormatting
If e.ColumnIndex = 3 Then
If e.Value = "" And e.Value.ToString.Length > 0 Then
e.Value = New String("*",e.Value.ToString.Length)
End If
End If

End Sub

Private Sub DataGridView1_EditingControlShowing(ByVal sender As Object,ByVal e As System.Windows.Forms.DataGridViewEditingControlShowingEventArgs) Handles DataGridView1.EditingControlShowing
Dim t As TextBox
t = e.Control

If Not t Is Nothing Then If Me.DataGridView1.CurrentCell.ColumnIndex = 3 Then t.PasswordChar = "*" Else t.PasswordChar = New Char() End If End If End Sub