一、取得數(shù)據(jù)表i行j列的值

//建立并打開數(shù)據(jù)庫連接
OleDbConnectionconn=newOleDbConnection();
conn.ConnectionString=strConnectionString;//strConnectionString為數(shù)據(jù)庫連接字符串
conn.Open();

stringsql="select*fromNewsClassorderbyClassIddesc";
stringx;
DataSetds=newDataSet();
OleDbDataAdapterda=newOleDbDataAdapter(sql,conn);
da.Fill(ds,"NewsTable");
DataTabledt=ds.Tables["NewsTable"];
x=dt.Rows[i][1].ToString()//數(shù)據(jù)表i行j列的值
conn.close();

二、將數(shù)據(jù)讀入DropDownList

（1）DropDownList中添加數(shù)據(jù)

//建立并打開數(shù)據(jù)庫連接
OleDbConnectionconn=newOleDbConnection();
conn.ConnectionString=strConnectionString;//strConnectionString為數(shù)據(jù)庫連接字符串
conn.Open();

stringsql="select*fromNewsClassorderbyClassIddesc";
//建立數(shù)據(jù)集
DataSetds=newDataSet();
OleDbDataAdapterda=newOleDbDataAdapter(sql,conn);
da.Fill(ds,"NewsTable");
this.DropDownList1.DataSource=ds;
this.DropDownList1.DataTextField="ClassName";//Text值
this.DropDownList1.DataValueField="ClassID";//Value值
this.DropDownList1.DataBind();

conn.Close();

（2）選中DropDownList的某項

this.DropDownList1.Items.FindByValue(dr["ClassID"].ToString().Trim()).Selected=true;//dr為DataRow

三、分類編碼檢索出相應的分類名稱并在DataGrid中顯示

（1）.ASPX中的代碼（ClassID為分類編碼）：

<asp:TemplateColumnHeaderText="類別">
<ItemTemplate>
<asp:Labelid=lblClassrunat="server"Text='<%#GetClassName(Convert.ToInt32(DataBinder.Eval(Container,"DataItem.ClassID")))%>'>
</asp:Label>
</ItemTemplate>
</asp:TemplateColumn>

（2）C#代碼：

///<summary>
///"分類"列根據(jù)數(shù)字返回文字
///</summary>
///<paramname="IsPassed"></param>
///<returns></returns>
publicstringGetClassName(intClassID)
{
　　OleDbConnectionconn=newOleDbConnection();
　　conn.ConnectionString=strConnectionString;
　　conn.Open();

　　stringsql="select*fromNewsClasswhereClassID="+ClassID;
　　DataSetds=newDataSet();
　　OleDbDataAdapterda=newOleDbDataAdapter(sql,conn);
　　da.Fill(ds,"ClassTable");
　　DataTabledt=ds.Tables["ClassTable"];
　　stringstrClassName=dt.Rows[0]["ClassName"].ToString();
　　conn.Close();

　　returnstrClassName;//返回ClassID對應的ClassName
}