在vb.net应用程序的System.Data.dll中发生了'System.Data.SqlClient.SqlException'类型的第一次机会异常

Question

我正在创建一个vb.net应用程序，我收到错误“ 'System.Data.SqlClient.SqlException'中出现System.Data.dll"类型的第一次机会异常我不知道如何解决此错误，表格中有4个字段

1. o_id主键自动递增1
2. c_id静态
3. owner_name varchar()

4. 投资

   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

您没有在任何地方添加参数@cid。

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