Question

C#中IF判断条件失效，也不报错，找不出来原因 。直接执IF里面语句,ELSE不起作用。什么不输也添加成功！

if (TextBox1.Text != null && TextBox2.Text != null && TextBox3.Text != null)
{
SqlCommand add = new SqlCommand("insert into room_info values ('" + TextBox2.Text + "','" + TextBox1.Text + "','" + TextBox3.Text + "')", con);
add.ExecuteReader();
Response.Write("<script language=javascript>alert('添加成功');window.window.location.href='min.aspx';</script> ");
}
else
{
Response.Write("<script language=javascript>alert('房间名、房间号或座位数为空，重新输入！');window.window.location.href='min.aspx';</script> ");
}

Answer 1

Text是不会等于null的，所以你的if就一定能有效，应该是
if (TextBox1.Text !="" && TextBox2.Text != "" && TextBox3.Text != "")
或者更完善点
if (TextBox1.Text.Trim() !="" && TextBox2.Text.Trim() != "" && TextBox3.Text.Trim() != "")

Answer 2

留联系瞧瞧！

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