Question

CSqlCommand cmd = new SqlCommand(); cmd.Connection = conn; cmd.CommandText = "Select count(*) from

C# 连接数据库 使用select 语句
CSqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandText = "Select count(*) fromcmd.CommandText = "Select count(*)from "+textBox1.Text.Trim();

Answer 1

你的sql 语句没有写完！

Answer 2

Select count(*) from dual

Answer 3

你的引号 都有问题。