textBox1.Text.Trim()和textBox1.Text 区别请问这两个的区别

' + textBox1.Text.Trim() + '里的' C#中的 textBox1.Text.Trim() 的 Trim()表示什么意思 C#中textBox1.Text.Trim()==“” 和textBox1.Text.Trim()... textBox1.Text.Trim()和textBox1.Text 区别请问这两个的区别 C#中textBox1.Text.Trim()==“” 和textBox1.Text.Trim()==NULL有什么区别? SqlConnection cn = new SqlConnection(conn); cn.Open();string str=update Grade set id=(' + TextBox1.Text.Trim() + ',sn=(' + TextBox2.Text.Trim() + ','+ TextBox3.Text.Trim() + ',' + TextBox4.Text.Trim() + ',' + TextBox5.Text.Trim() + ',' + 在C#中num1 = Convert.ToInt32(textBox1.Text.Trim());这句代码是什么意思啊?主要是不知道textBox1.Text.Trim()这句是什么意思 TextBox1.Text &= Space(4 - Len(Trim(sc(i,j)))) & sc(i, 提示错误必须声明标量变量@sexwhere.sqlStr += [Spec]=' + comboBox1.Text + ', + [Sex]=@Sex;sqlStr += Where ReaderID=' + textBox1.Text.Trim() + '; 英语翻译private void button1_Click(object sender,EventArgs e){if (textBox1.Text.Trim() == || textBox2.Text.Trim() == ){MessageBox.Show(请输入用户名和密码,错误提示);}else{DB.cn.Open();OleDbCommand cmd = new OleDbCommand(,DB name.text.trim() if (textBox1.Text == 0) textBox1.Text = ; this.textBox1.Text += 1; 这句话的单引号什么意思?SqlCommand cmd = new SqlCommand(select * from login where username = ' + this.TextBox1.Text.Trim() + ' TextBox1.Text = Mid(TextBox1.Text,1,Len(TextBox1.Text) - 那位朋友知道请回答一下, num = int.Parse(textBox1.Text); ls_text=upper(trim(sle_1.text))是什么意思 textpassward.Text.Trim() == string.Empty； private void button11_Click(object sender,EventArgs e){Button btn = (Button)sender;textBox1.Text = textBox1.Text + + btn.Text + ;}private void button12_Click(object sender,EventArgs e){Button btn = (Button)sender;textBox1.Text = textBox1.Text