这种报错怎么处理呢？

以下为源代码，和报错图片

public partial class Default1 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}
protected void Box_Click(object sender, EventArgs e)
{

}
protected void btn_Click(object sender, EventArgs e)
{
  
    String connection="Data Source=.;Initial Catalog=no1;Integrated Security=SSPI";

SqlConnection con=new SqlConnection(connection);
con.Open();
string ConnectionString=ConfigurationManager.ConnectionStrings["othername"].ToString();
String sql2 ="insert into num(Table）（username，password）values('"+name+"','"+password+"')";
SqlCommand cmd=new SqlCommand(sql2,con);

cmd.ExecuteNonQuery();

con.Close();
Response.Write("HelloWorld!你的手机号是" + telephone.Text);
Response.Write("HelloWorld!你的密码是"+password.Text );
Response.Write("你的用户名是" + name.Text);
Response.Write("你再次输入的密码是" + password1.Text);

}
protected void btn1_Click(object sender, EventArgs e)
{
 
    String connection = "Data Source=.;Initial Catalog=no1;Integrated Security=SSPI";
    SqlConnection con = new SqlConnection(connection);
    con.Open();
    string ConnectionString = ConfigurationManager.ConnectionStrings["othername"].ToString();
    String sql1 = "select*from <Table> where id = 1";
    SqlCommand cmd = new SqlCommand(sql1, con);
    SqlDataReader read=cmd.ExecuteReader();
    if(read.Read())
    { 
    Response.Write(read["username"]+";"+read["password"]);
    }
    else{
        Response.Write("查不到");
    }
    con.Close();
    Response.Write("<script>alert('登录成功');</script>");

}

}