System.InvalidOperationException連接到SQLExpress數據庫？

Question

protected void btnSubmit_Click(object sender, EventArgs e) 
{ 
    SqlConnection con = new SqlConnection(@"Data Source= LAPTOP-KVFS4TPD\\SQLEXPRESS; Database= PayPalDB; UID= sa; PWD= 061199081298;"); 
    SqlCommand cmd = new SqlCommand("SP_DBASE", con); 
    cmd.CommandType = CommandType.StoredProcedure; 
    con.Open(); 
    cmd.Parameters.AddWithValue("@FirstName", FNtxt.Text); 
    cmd.Parameters.AddWithValue("@MiddleName", MNtxt.Text); 
    cmd.Parameters.AddWithValue("@LastName", LNtxt.Text); 
    cmd.Parameters.AddWithValue("@Email", Emailtxt.Text); 
    cmd.Parameters.AddWithValue("@Email2", Email2txt.Text); 
    cmd.Parameters.AddWithValue("@BirthDate", txtDate.Text); 
    cmd.Parameters.AddWithValue("@Address", Addresstxt.Text); 
    cmd.Parameters.AddWithValue("@CreditCardNo", CCNtxt.Text); 
    cmd.Parameters.AddWithValue("@CVVNo", CVVtxt.Text); 
    cmd.Parameters.AddWithValue("@Gender", GenderRDL.SelectedItem); 
    cmd.Parameters.AddWithValue("@Country", DDLCountry.SelectedItem); 
    cmd.ExecuteNonQuery(); 
    con.Close(); 

    Server.Transfer("UserLogIn.aspx", true); 
} 

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的錯誤是在con.Open();：

'System.InvalidOperationException' 類型出現在system.data.dll但在用戶代碼中沒有處理」的例外

Answer 1

您的連接字符串錯誤

這是正確的語法的SQLExpress連接字符串：

Data Source=.\SQLEXPRESS;Database=myDataBase;Uid=myUsername;Pwd=myPassword; 

你的情況：

SqlConnection con = new SqlConnection(@"Data Source=.\SQLEXPRESS;Database=PayPalDB;UID=sa;PWD=061199081298;");