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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
OleDbConnection conn=new OleDbConnection();
conn.ConnectionString=strConnectionString;//strConnectionString為數(shù)據(jù)庫連接字符串
conn.Open();
string sql="select * from NewsClass order by ClassId desc";
string x;
DataSet ds=new DataSet();
OleDbDataAdapter da=new OleDbDataAdapter(sql,conn);
da.Fill(ds,"NewsTable");
DataTable dt=ds.Tables["NewsTable"];
x=dt.Rows[i][1].ToString()//數(shù)據(jù)表i行j列的值
conn.close();
//建立并打開數(shù)據(jù)庫連接
OleDbConnection conn=new OleDbConnection();
conn.ConnectionString=strConnectionString;//strConnectionString為數(shù)據(jù)庫連接字符串
conn.Open();
string sql="select * from NewsClass order by ClassId desc";
string x;
DataSet ds=new DataSet();
OleDbDataAdapter da=new OleDbDataAdapter(sql,conn);
da.Fill(ds,"NewsTable");
DataTable dt=ds.Tables["NewsTable"];
x=dt.Rows[i][1].ToString()//數(shù)據(jù)表i行j列的值
conn.close();
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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
OleDbConnection conn=new OleDbConnection();
conn.ConnectionString=strConnectionString;//strConnectionString為數(shù)據(jù)庫連接字符串
conn.Open();
string sql="select * from NewsClass order by ClassId desc";
//建立數(shù)據(jù)集
DataSet ds=new DataSet();
OleDbDataAdapter da=new OleDbDataAdapter(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();
//建立并打開數(shù)據(jù)庫連接
OleDbConnection conn=new OleDbConnection();
conn.ConnectionString=strConnectionString;//strConnectionString為數(shù)據(jù)庫連接字符串
conn.Open();
string sql="select * from NewsClass order by ClassId desc";
//建立數(shù)據(jù)集
DataSet ds=new DataSet();
OleDbDataAdapter da=new OleDbDataAdapter(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();
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（2）選中DropDownList的某項
this.DropDownList1.Items.FindByValue(dr["ClassID"].ToString().Trim()).Selected=true;
//dr為DataRow
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this.DropDownList1.Items.FindByValue(dr["ClassID"].ToString().Trim()).Selected=true;
//dr為DataRow
this.DropDownList1.Items.FindByValue(dr["ClassID"].ToString().Trim()).Selected=true;
//dr為DataRow
this.DropDownList1.Items.FindByValue(dr["ClassID"].ToString().Trim()).Selected=true;
//dr為DataRow
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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:TemplateColumn HeaderText="類 別">
<ItemTemplate>
<asp:Label id=lblClass runat="server" Text='<%# GetClassName(Convert.ToInt32(DataBinder.Eval(Container, "DataItem.ClassID"))) %>'>
</asp:Label>
</ItemTemplate>
</asp:TemplateColumn>
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<asp:TemplateColumn HeaderText="類 別"> <ItemTemplate> <asp:Label id=lblClass runat="server" Text='<%# GetClassName(Convert.ToInt32(DataBinder.Eval(Container, "DataItem.ClassID"))) %>'>
</asp:Label>
</ItemTemplate>
</asp:TemplateColumn>
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（2）C#代碼
///
/// "分類"列根據(jù)數(shù)字返回文字
///
///
///
public string GetClassName(int ClassID)
{
OleDbConnection conn=new OleDbConnection();
conn.ConnectionString=strConnectionString;
conn.Open();
string sql="select * from NewsClass where ClassID="+ClassID;
DataSet ds=new DataSet();
OleDbDataAdapter da=new OleDbDataAdapter(sql,conn);
da.Fill(ds,"ClassTable");
DataTable dt=ds.Tables["ClassTable"];
string strClassName=dt.Rows[0]["ClassName"].ToString();
conn.Close();
return strClassName;//返回 ClassID對應的ClassName
}
///
/// "分類"列根據(jù)數(shù)字返回文字
///
///
///
public string GetClassName(int ClassID)
{
OleDbConnection conn=new OleDbConnection();
conn.ConnectionString=strConnectionString;
conn.Open();
string sql="select * from NewsClass where ClassID="+ClassID;
DataSet ds=new DataSet();
OleDbDataAdapter da=new OleDbDataAdapter(sql,conn);
da.Fill(ds,"ClassTable");
DataTable dt=ds.Tables["ClassTable"];
string strClassName=dt.Rows[0]["ClassName"].ToString();
conn.Close();
return strClassName;//返回 ClassID對應的ClassName
}
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