C#中comboBox下拉框如何绑定Access数据库

1.  C#中comboBox用代码绑定数据库中在某一列。用处：跟radioButton联系在一起，可以根据radioButton在选择而在comboBox显示出不同的值。

2. private void radioButton1_Click(object sender, EventArgs e)
           {
               
                   comboBox1.Items.Clear();      //清空ComBox

                   string connStr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=mydb.mde;Jet OLEDB:Database Password=asd123456789";

                   OleDbConnection con = new OleDbConnection(connStr);  //创建一个新连接 
                   con.Open();
                   OleDbCommand cmd = con.CreateCommand();
                   cmd.CommandText = "SELECT 年份 FROM 任务记录";   //在这儿写sql语句
                   OleDbDataReader sdr = cmd.ExecuteReader();        //创建一个OracleDateReader对象 
                   while (sdr.Read())
                   {
                       comboBox1.Items.Add(sdr[0].ToString());        //循环读区数据
                   }
                   con.Close();
              
           }

3. 因为从数据库读入的数据会有很多重复的，在comboBox下拉框中要把重复在合并在一起，可以用下面在语句替代上面在sql查询语句：

   cmd.CommandText = "SELECT distinct 年份 FROM 任务记录";

string sql ="select 物品名,物品属性 from prop";
richTextBox.text=""
SqlDataAdapter myda = new SqlDataAdapter(sqlstr, objConnection);
DataTable mydt = new DataTable();
myda.Fill(mydt);
mycon.Close();
foreach (DataRow dr in mydt.Rows)
{
comboBox.Items.Add(dr[0].ToString());
richTextBox.text+=dr[1].ToString());
}

全代码:
private void Form1_Load(object sender, EventArgs e)
{
string strConnection = "Provider=Microsoft.Jet.OleDb.4.0;";
strConnection += @"Data Source=D:\Data\DotaData.mdb";
OleDbConnection objConnection = new OleDbConnection(strConnection);
objConnection.Open();
string sql = "select 物品名,物品属性 from Prop";
OleDbCommand cmd = new OleDbCommand(sql,objConnection);
OleDbDataReader reader = cmd.ExecuteReader();
comboBox1.Items.Clear();
while(reader.Read()){
comboBox1.Items.Add((string)reader["物品名"]); //添加物品名到combobox
richTextBox1.Text + = (string)reader["物品属性"]); //添加物品属性刀richTextBox

}

cmd.Dispose();
reader.Close();
objConnection.Close();
}