DropDownList索引問題

我想從存儲過程數據庫連接綁定一個DropDownList。我能夠使用表的唯一標識字段和「Unit_ID」字段填充dropDownList。信息在DropDownList上正確填充。但是，從列表中選擇一個選定的項目並將該值存儲到存儲過程插入時，我收到一個超出範圍錯誤的索引。這裏是我的代碼：DropDownList索引問題

private void DisplayUnitType() 
{ 

    SqlConnection Db_Connection = new SqlConnection(Utilities.PageUtils.ConStr); 
    SqlDataAdapter DA = new SqlDataAdapter("SM_GET_UNITS", Db_Connection); 
    DA.SelectCommand.CommandType = CommandType.StoredProcedure; 
    DataSet DS = new DataSet(); 
    DA.Fill(DS, "Units"); 
    this.DropDownList_Unit_Type.DataSource = DS.Tables["Units"].DefaultView; 
    this.DropDownList_Unit_Type.DataTextField = "Unit_Name"; 
    this.DropDownList_Unit_Type.DataValueField = "Unit_ID"; 
    this.DropDownList_Unit_Type.DataBind(); 
    // 
} 

protected void Button_Submit_Click1(object sender, ImageClickEventArgs e) 
{ 
    RegisterUser(); 
} 
private void RegisterUser() 
{ 
    string UnitAdministratorInfo = string.Empty; 
    try 
    { 

     SqlConnection conn = new SqlConnection(Utilities.PageUtils.ConStr); 
     // format Validation code 
     string code = Utilities.PageUtils.MD5encrypt(System.DateTime.Now.ToString() + Session["User_Id"].ToString()); 
     // define data reader7 
     SqlCommand cmdInsertUser = new SqlCommand("RG_INSERT_NEW_USER2",conn); 
     cmdInsertUser.CommandType = CommandType.StoredProcedure; 

     cmdInsertUser.Parameters.AddWithValue("@Unit_Id", this.DropDownList_Unit_Type.SelectedItem.Value); //Trying to insert unique item value from dropdown to here 
     cmdInsertUser.Parameters.AddWithValue("@Validation_Code",code); 
     cmdInsertUser.Parameters.AddWithValue("@User_Id",Session["User_Id"].ToString()); 
     cmdInsertUser.Parameters.AddWithValue("@First_Name",Session["First_Name"].ToString()); 
     cmdInsertUser.Parameters.AddWithValue("@Last_Name",Session["Last_Name"].ToString()); 
     cmdInsertUser.Parameters.AddWithValue("@Password",Utilities.PageUtils.MD5encrypt(Session["Password"].ToString())); 
     cmdInsertUser.Parameters.AddWithValue("@Middle_Name",Session["Middle_Name"].ToString()); 
     cmdInsertUser.Parameters.AddWithValue("@Email_Address",Session["Email_Address"].ToString()); 
     cmdInsertUser.Parameters.AddWithValue("@Color_Id",1); 
     cmdInsertUser.Parameters.AddWithValue("@DSN",Session["DSN"].ToString()); 
     cmdInsertUser.Parameters.AddWithValue("@Phone",Session["Phone"].ToString()); 
     cmdInsertUser.Parameters.AddWithValue("@Zip_Code",Session["Zip_Code"].ToString()); 
     cmdInsertUser.Parameters.AddWithValue("@Organization",Session["Organization"].ToString()); 
     conn.Open(); 
     cmdInsertUser.ExecuteNonQuery(); 
     cmdInsertUser.Parameters.Clear(); 
     conn.Close(); 
    } 
    catch(SqlException ex) 
    { 
     ErrorHandler.Catcher.CatchToDb(ex, "Register2.aspx", Request, Utilities.PageUtils.ConStr); 
     Response.Write(Session["User_Id"].ToString() + "<br>" + "</ br>"); 
     Response.Write(ex.ToString()); 
     if(ex.ToString().IndexOf("duplicate") != -1 || ex.InnerException.ToString().IndexOf("duplicate") != -1) 
     { 
      if(Session["User_Id"] == null || Session["User_Id"].ToString() == "") Response.Redirect(Utilities.PageUtils.ErrorPage+"?Error_Message=An error occurred while processing your registration. Please try again. If the problem persists, please notify a system administrator.", false); 
      else 
      { 
       Session["User_Id"] = Session["User_Id"].ToString() + "1"; 
       RegisterUser(); 
       return; 
      } 
     } 
    } 
    try 
    {

這是我的錯誤：

Index was out of range. Must be non-negative and less than the size of the collection. 
Parameter name: index 
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection. 
Parameter name: index 

Source Error: 


Line 126:   catch(SqlException ex) 
Line 127:   { 
Line 128:    ErrorHandler.Catcher.CatchToDb(ex, "Register2.aspx", Request, Utilities.PageUtils.ConStr); 
Line 129:    Response.Write(Session["User_Id"].ToString() + "<br>" + "</ br>"); 
Line 130:    Response.Write(ex.ToString()); 


Source File: g:\Documents\Visual Studio 2010\WebSites\myWebSite\Register2.aspx.cs Line: 128 

Stack Trace: 


[ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection. 
Parameter name: index] 
    System.Collections.ArrayList.get_Item(Int32 index) +7493656 
    System.Collections.Specialized.NameObjectCollectionBase.BaseGetKey(Int32 index) +13 
    System.Collections.Specialized.KeysCollection.Get(Int32 index) +11 
    System.Collections.Specialized.KeysCollection.get_Item(Int32 index) +7 
    ErrorHandler.Catcher.CatchToDb(Exception ex, String User_Id, HttpRequest Req, String ConStr) +1670 
    Register2.RegisterUser() in g:\Documents\Visual Studio 2010\WebSites\NacWebSite\Register2.aspx.cs:128 
    Register2.Button_Submit_Click1(Object sender, ImageClickEventArgs e) in g:\Documents\Visual Studio 2010\WebSites\myWebSite\Register2.aspx.cs:93 
    System.Web.UI.WebControls.ImageButton.OnClick(ImageClickEventArgs e) +108 
    System.Web.UI.WebControls.ImageButton.RaisePostBackEvent(String eventArgument) +118 
    System.Web.UI.WebControls.ImageButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10 
    System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13 
    System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +36 
    System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1565 




-------------------------------------------------------------------------------- 
Version Information: Microsoft .NET Framework Version:2.0.50727.3649; ASP.NET Version:2.0.50727.3648

來源

2013-12-13 user3100555

看着堆棧跟蹤，錯誤似乎是從'ErrorHandler.Catcher.CatchToDb'電話來了。如果該代碼被觸發，你可能也有一個SqlException。 – Fid