vb.net應用程序System.Data.dll中發生類型'System.Data.SqlClient.SqlException'的第一次機會異常

Question

我正在創建一個vb.net應用程序，其中出現錯誤「 第一次機會'System.Data.SqlClient.SqlException'類型的異常出現在System.Data.dll"我不知道如何解決這個錯誤，並有在表4場

1. o_id主鍵自動遞增1
2. c_id靜態
3. OWNER_NAME varchar()

4. 投資

   Dim connetionString As String 
   
   Dim cnn As SqlConnection 
   
   Dim cmd As New SqlCommand 
   
   
   connetionString = "Data Source=.\SQLEXPRESS;AttachDbFilename='C:\Users\javed\Documents\Visual Studio 2008\Projects\WindowsApplication1\WindowsApplication1\bin\Debug\Database1.mdf';Integrated Security=True;User Instance=True" 
   
   cnn = New SqlConnection(connetionString) 
   
   Try 
   
       cnn.Open() 
       MsgBox("Connection is Open ! ") 
       cmd.Connection = cnn 
       cmd.CommandText = "INSERT INTO owner_detail(c_id, o_name, investment) values(@cid,'" + TextBox1.Text + "','" + TextBox2.Text + "')" 
       cmd.ExecuteNonQuery() 
       MsgBox("Data is Successfully Inserted! ") 
       cnn.Close() 
   
   Catch ex As Exception 
   
       MsgBox("Can not open connection ! ") 
   
   End Try 
   

Answer 1

您沒有添加參數@cid任何地方。

cmd.Parameters.Add(new SqlParameter("@cid", SqlDbType.Int)) 
cmd.Parameters("@cid").Value = Idvalue