将组合框值传递给类文件集失败

问题描述

Object reference not set to an instance of an object

Form2 fr2 = new Form2();
                    
                     string srv = fr2.sqlServerComboBox.SelectedItem.ToString();
                     string pass = fr2.passwordTextBox.Text.ToString();
                     string database = fr2.databaseComboBox.SelectedItem.ToString();
                   

                   string str = @"Data Source=srv;" + "Initial Catalog=database;" + "Persist Security Info=True;" + "User ID=sa;" + "Password=pass";

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