一个最简单的登录例子

1 string strConnString = "server = (local); database = myStudy; uid = sa;pwd = ";

2 private void Button1_Click(object sender, System.EventArgs e)

3 {

4 SqlConnection conn = new SqlConnection(strConnString);

5 string sqlCmd = "select * from testuser where name ='"+this.TextBox1.Text.Trim()+"' and pwd = '"+this.TextBox2.Text.Trim()+"'";

6 SqlDataAdapter da = new SqlDataAdapter();

7 da.SelectCommand = new SqlCommand(sqlCmd,conn);

8 // SqlDataAdapter da = new SqlDataAdapter(sqlCmd,conn);

9 // DataTable tb = new DataTable();

10 DataSet ds = new DataSet();

11 da.Fill(ds);

12 if(ds.Tables[0].Rows.Count > 0 )

13 {

14 this.Label1.Text = "成功!";

15 }

16 else

17 {

18 this.Label1.Text = "失败!";

19 }

20

21 }