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nw和nh是宽和度，originalImage为原始图像
System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(nw, nh);
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
g.Clear(Color.Transparent);
g.DrawImage(originalImage, new Rectangle(0, 0, nw, nh), new Rectangle(x, y, ow, oh), GraphicsUnit.Pixel);

bitmap.Save(Server.MapPath(filename));

 <script language="JavaScript" charset="gb2312" type="text/javascript" src="../Area.js"></script>
<form id="myForm"  method="post">
<select name="province" class="p9" size="1" onclick="javascript:sdistrict(document.myForm.Street,this.value)" style="font-size: 12">
                            <option value="">不限</option>
<option value="1">朝阳区</option>
<option value="2">海淀区</option>
<option value="3">丰台区</option>
<option value="4">东城区</option>
<option value="5">西城区</option>
<option value="6">宣武区</option>
<option value="7">崇文区</option>
<option value="8">石景山区</option>
<option value="9">通州区</option>
<option value="10">昌平区</option>
<option value="11">大兴区</option>
<option value="12">其他</option>
                          </select> &nbsp;&nbsp;地区
                          <select size="1" width="4" name="Street">
                            <option value="">　　　　</option>
                          </select>
     </form>
--------------------------------------cs
public String PrintArea(Int32 CityID)
  {
   String strHTML ="";
   DataTable dtArea = InfoHandle.GetAllArea(CityID).Tables[0];
   if(dtArea.Rows.Count>0)
   {
    strHTML += "<select name=\"Area\" class=\"p9\" size=\"1\"  onclick=\"javascript:sdistrict(document.myForm.Street,this.value)\" style=\"font-size: 12\">\r\n";
    strHTML += "<option value=\"0\">默认</option>";
    foreach(DataRow dr in dtArea.Rows)
    {
     strHTML += "<option value=\""+dr["AreaID"]+"\">";
     strHTML += dr["AreaName"];
     strHTML += "</option>\r\n";    
    }
    strHTML += "</select>\r\n&nbsp;&nbsp;=>";
    strHTML += " <select size=\"1\" width=\"4\" name=\"Street\">\r\n";
    strHTML += "   <option value=\"0\">默认</option>\r\n";
    strHTML += " </select>\r\n";
    //    DataTable dtStreet=InfoHandle.GetAreaID(CityID,AreaID).Tables[0];
    //    if(dtStreet.Rows.Count>0)
    //    {
    //     foreach(DataRow drs in dtStreet.Rows)
    //     {
    //      strHTML += "<a href=\"AddInfo.aspx?Type="+drs["AreaID"]+"\">";
    //      strHTML += drs["AreaName"]+"</a>&nbsp;&nbsp;";
    //     }
    //    }
   }
   return strHTML;
  }
---------------------------------------------
var Street;
var Areas;
var name1;
Areas=new Array(12);
Street=new Array(12);
name1=new Array(12);
Areas[1]="1";
Street[1]=new Array(15);
name1[1]=new Array(15);
Street[1][1]="13";
name1[1][1]="亚运村";
Street[1][2]="14";
name1[1][2]="三元桥";
Street[1][3]="15";
name1[1][3]="建外大街 国贸";
Street[1][4]="16";
name1[1][4]="国展 西坝河";
Street[1][5]="17";
name1[1][5]="三里屯 朝外大街";
Street[1][6]="18";
name1[1][6]="劲松";
Street[1][7]="19";
name1[1][7]="燕莎";
Street[1][8]="20";
name1[1][8]="团结湖";
Street[1][9]="21";
name1[1][9]="京广侨 红庙 八里庄";
Street[1][10]="22";
name1[1][10]="望**家地";
Street[1][11]="23";
name1[1][11]="安贞桥 安华侨";
Street[1][12]="24";
name1[1][12]="潘家园";
Street[1][13]="25";
name1[1][13]="酒仙桥 将台路";
Street[1][14]="26";
name1[1][14]="呼家楼";
Street[1][15]="27";
name1[1][15]="其他";
Areas[2]="2";
Street[2]=new Array(4);
name1[2]=new Array(4);
Street[2][1]="28";
name1[2][1]="中关村";
Street[2][2]="29";
name1[2][2]="北京大学";
Street[2][3]="30";
name1[2][3]="清华大学";
Street[2][4]="31";
name1[2][4]="上地";
Areas[3]="3";
Street[3]=new Array(0);
name1[3]=new Array(0);
Areas[4]="4";
Street[4]=new Array(0);
name1[4]=new Array(0);
Areas[5]="5";
Street[5]=new Array(0);
name1[5]=new Array(0);
Areas[6]="6";
Street[6]=new Array(0);
name1[6]=new Array(0);
Areas[7]="7";
Street[7]=new Array(0);
name1[7]=new Array(0);
Areas[8]="8";
Street[8]=new Array(0);
name1[8]=new Array(0);
Areas[9]="9";
Street[9]=new Array(0);
name1[9]=new Array(0);
Areas[10]="10";
Street[10]=new Array(0);
name1[10]=new Array(0);
Areas[11]="11";
Street[11]=new Array(0);
name1[11]=new Array(0);
Areas[12]="12";
Street[12]=new Array(0);
name1[12]=new Array(0);
function clear(o){
   l=o.length;
   for (i = 0; i< l; i++)
   {
    o.options[1]=null;
   }
  }
function sdistrict(oj,v){
    m=-1;
    for (i=1;i<=13;i++)
     {
      if (Areas[i]==v)
      {
       m=i;
      }
     }
     clear(oj);
     if (m!=-1)
     {
      for (i=1;i<Street[m].length;i++)
      {
       oj.add(new Option(name1[m][i],Street[m][i]));
      }
     }
    }

 

解决办法
javascript:sdistrict(document.getElementById('City'),this.value)

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又有问题，来测试了