武眉博<活靶子.Net>    所有文字以“现状“提供且没有任何担保也没有授予任何权利,仅代表作者个人意见

两个DropDownList在Repeater、DataList、DataGrid内的连动和冒泡事件(BubbleEvent)
        问题: http://community.csdn.net/Expert/topic/4670/4670056.xml?temp=3.944033E-02
        刚看第一眼觉得在第一个DDL的SelectedIndexChanged事件内绑定第二个DDL就ok了，页面上写或者ItemDataBound内写事件挂接代码都可以。打开VS写测试却发现有点障碍哦，
在SelectedIndexChanged内要知道去绑定哪个行哪个列的DDL要费些周折。
只有从DDL一级一级的向上找Parent最后找到DataGridItem，再利用其ItemIndex定位到行然后FindControl到要绑定的DDL，最终可以实现，好像比较累哦。
        随又想到DataGrid的ItemCommand事件，但发现WebControl内只有Button ImageButton LinkButton有CommandName属性和 CommandArgument属性，并可以将事件上浮（冒泡）.DropDownList先天不足！真是郁闷~~~~~ 能不能自己改造呢？动手试试就知道了。

http://www.aspxboy.com/Files/71/66/284.Aspx

如果 AutoGenerateColumns="false" 使用绑定列，模板列
则比较好办，直接使用 YourDataGrid.Columns[编号].HeaderText 获得
可是,如果 AutoGenerateColumns="true" ,就比较麻烦了,因为这时YourDataGrid.Columns.Count是0
但是可以变通做到。

示例：

 
http://www.aspxboy.com/Files/71/66/284.Aspx

手中的活计需要打印,就到处找找。
从google中扑获,挺不错的，大家共享～
how can i print the data in DataGrid?
http://forums.aspfree.com/archive/t-17107
http://forums.aspfree.com/t17107/s.html

using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Printing;
using System.Data;

using System.Windows.Forms;

namespace Hooooo.Print
{
public class DataGridPrinter
{
private DataGrid dataGrid;
private PrintDocument printDocument;
private PageSetupDialog pageSetupDialog;
private PrintPreviewDialog printPreviewDialog;

public DataGridPrinter(DataGrid dataGrid)
{ 
this.dataGrid = dataGrid; 
printDocument = new PrintDocument();
printDocument.PrintPage += new PrintPageEventHandler(this.printDocument_PrintPage);
} 

private void printDocument_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
{
int rowCount = 0;
int colCount = 0;
int x = 0;
int y = 0;
int rowGap = 20;
int colGap = 5;
int leftMargin = 50;
Font font = new Font("Arial", 10);
Font headingFont = new Font("Arial", 11, FontStyle.Underline);
Font captionFont = new Font("Arial", 10, FontStyle.Bold); 
Brush brush = new SolidBrush(Color.Black);
string cellValue = "";

if(dataGrid.DataSource.GetType().ToString() == "System.Data.DataTable")
{
rowCount = ((DataTable)dataGrid.DataSource).Rows.Count;
}
else if(dataGrid.DataSource.GetType().ToString() == "System.Collections.ArrayList")
{
rowCount = ((ArrayList)dataGrid.DataSource).Count;
}
colCount = dataGrid.TableStyles[0].GridColumnStyles.Count;

//print caption
if(dataGrid.CaptionVisible)
{
y += rowGap;
x = leftMargin;
e.Graphics.DrawString(dataGrid.CaptionText, captionFont, brush, x, y);
}

//print headings 
y += rowGap;
x = leftMargin;
for(int j = 0; j < colCount; j++)
{
if(dataGrid.TableStyles[0].GridColumnStyles[j].Width > 0)
{
cellValue = dataGrid.TableStyles[0].GridColumnStyles[j].HeaderText; 
e.Graphics.DrawString(cellValue, headingFont, brush, x, y);
x += dataGrid.TableStyles[0].GridColumnStyles[j].Width + colGap; 
}
} 

//print all rows
for(int i = 0; i < rowCount; i++)
{
y += rowGap;
x = leftMargin;
for(int j = 0; j < colCount; j++)
{
if(dataGrid.TableStyles[0].GridColumnStyles[j].Width > 0)
{
cellValue = dataGrid[i,j].ToString(); 
e.Graphics.DrawString(cellValue, font, brush, x, y);
x += dataGrid.TableStyles[0].GridColumnStyles[j].Width + colGap;
y = y + rowGap * (cellValue.Split(new char[] {'\r', '\n'}).Length - 1); 
}
} 
}
string s = cellValue;
string f3 = cellValue;
}

public PrintDocument GetPrintDocument()
{
return printDocument;
}

public void Print()
{
try
{
pageSetupDialog = new PageSetupDialog();
pageSetupDialog.Document = printDocument;
pageSetupDialog.ShowDialog();
printPreviewDialog = new PrintPreviewDialog();
printPreviewDialog.Document = printDocument;
printPreviewDialog.Height = 600;
printPreviewDialog.Width = 800;
printPreviewDialog.ShowDialog();
}
catch(Exception e)
{
throw new Exception("Printer error." + e.Message);
}

}
} 
}

需要打印表格线条及分页的朋友，可以看一下下面这篇文章：
 

How to Print a DataGrid in C# and .NET