如何在Asp.Net C＃中引用文本框，下拉列表等控件

Question

如何引用控件？使用DropDownList作为示例。我想引用“ddlName”（现有下拉列表的名称），就像在VFP中使用宏一样。我最终想用它来传递参数。提前谢谢！

protected void PopulateName() {  
        string DataPara= "name";         // Parameter1    
        SqlPara = "SELECT x FROM x";     // Parameter2     
        newname = "ddlName";             // Parameter3      ?          
        SqlConnection connData = new SqlConnection();
        connData.ConnectionString = 
            ConfigurationManager.ConnectionStrings["ConnSqlUsr"].ConnectionString;
        connData.Open();            
        SqlCommand connCmd = new SqlCommand(SqlPara, connData);     
        SqlDataReader connDr = connCmd.ExecuteReader();     
        newname.DataSource = connDr;       ?    
        newname.DataValueField = DataPara; ?        
        newname.DataTextField = DataPara;  ?            
        newname.DataBind();                ?       
        connDr.Close();           
        connDr.Dispose();         
        connCmd.Dispose(); 

Answer 1

LoginView1是页面名称

     DropDownList ddl =  (DropDownList)LoginView1.FindControl("ddlName");
 ddl.DataSource = connDr;       ?    
        ddl.DataValueField = DataPara; ?        
        ddl.DataTextField = DataPara;  ?            
        ddl.DataBind();