Asp.net如何糾正錯誤

-3

using System; 
using System.Collections; 
using System.Configuration; 
using System.Data; 
using System.Linq; 
using System.Web; 
using System.Web.Security; 
using System.Web.UI; 
using System.Web.UI.HtmlControls; 
using System.Web.UI.WebControls; 
using System.Web.UI.WebControls.WebParts; 
using System.Xml.Linq; 
using System.Data.SqlClient; 

public partial class Bookcheck : System.Web.UI.Page 
    { 

    protected void Page_Load(object sender, EventArgs e) 
    { 

    } 
    protected void Button1_Click(object sender, EventArgs e) 
    { 
     SqlDataAdapter da=new SqlDataAdapter(); 
     SqlConnection cnn=new SqlConnection(); 
     DataSet ds = new DataSet(); 
     string constr = null; 
     SqlCommand cmd = new SqlCommand(); 
     if (IsValid != null) 
     { 
      constr = @"Data Source=DEVI\SQLEXPRESS; Initial Catalog =librarymanagement; 
Integrated Security=SSPI"; 
      cnn.ConnectionString = constr; 
      try 
      { 
       if (cnn.State != ConnectionState.Open) 
        cnn.Open(); 
      } 
      catch (Exception ex) 
      { 
       string str1 = null; 
       str1 = ex.ToString(); 
      } 
      cmd.Connection = cnn ; 

      cmd.CommandType = CommandType.StoredProcedure; 
      cmd.CommandText = "spbookcheck"; 
      cmd.Parameters.Clear(); 
      cmd.Parameters.AddWithValue("bookid", txtid.Text); 
      cmd.Parameters.AddWithValue("Nameofthebook", txtnb.Text); 
      da.SelectCommand=cmd; 
      try 
      { 
       da.Fill(ds); 
      } 
      catch (Exception ex) 
      { 

       string strErrMsg = ex.Message; 
       // throw new ApplicationException 
      } 
      finally 
      { 
       da.Dispose(); 
       cmd.Dispose(); 
       cnn.Close(); 
       cnn.Dispose(); 
      } 
      if (ds.Tables[0].Rows.Count > 0) 
      { 
       Msg.Text = "bookcheck successfully"; 
       Response.Redirect("Issueofbook.aspx"); 
      } 
      else 
      { 
       Msg.Text="bookcheck failed"; 
      } 
     } 



    } 

}

我的錯誤Asp.net如何糾正錯誤

索引超出範圍異常的未經處理過的用戶無法找到表0

來源

2011-02-23 kannan

也許你可以告訴我們你得到了什麼錯誤。 –

@joel Etherton記錄沒有插入，然後錯誤超出範圍異常投擲用戶 – kannan

@joel Etherton頁面運行，然後任何重新插入請幫助我如何更改.... – kannan

這條線：

if (ds.Tables[0].Rows.Count > 0)

假設您的數據集中有表格。在嘗試訪問表之前，需要檢查ds.Tables.Count是否> 0。

來源

2013-08-07 21:26:02

好答案戴夫！ –

Asp.net如何糾正錯誤

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