Wrong Format of the initialization string in ADO.NET - wpf

Question

I just have a simply method show below:
private void Button_Click_1(object sender, RoutedEventArgs e)
{
string sqlcmdString = string.Format("UPDATE Bills SET Name = '#name', Time = '#time', Product = '#pro', Price = #money WHERE Name = '#value';");
using (SqlConnection con = new SqlConnection(sqlcmdString))
using (SqlCommand cmd = new SqlCommand("dbo.Bills", con))
{
// tell ADO.NET it's a stored procedure (not inline SQL statements)
cmd.CommandType = CommandType.StoredProcedure;
// define parameters
cmd.Parameters.Add("#name", SqlDbType.NVarChar, 100).Value = tb_TenKH.Text;
cmd.Parameters.Add("#time", SqlDbType.DateTime).Value = cb_Thoigian.Text;
cmd.Parameters.Add("#pro", SqlDbType.NVarChar, 100).Value = tb_SanPham.Text;
cmd.Parameters.Add("#money", SqlDbType.Money).Value = tb_ThanhTien.Text;
cmd.Parameters.Add("#value", SqlDbType.NVarChar, 100).Value = cellvalue;
// open connection, execute stored procedure, close connection again
con.Open();
if (cmd.ExecuteNonQuery() > 0)
{
//dosomething
}
else
{
MessageBox.Show("Failed!!!");
}
con.Close();
}
}
This lines could not be run. When i debug it, it shows error:
System.ArgumentException: 'Format of the initialization string does
not conform to specification starting at index 0.'
I aware that something went wrong in my sqlcmdString maybe about syntax, but I couldn't determine it. Please give me a help.

Answer 1

I'm wrong in syntax: I should use like below:
string sqlcmdString = string.Format("UPDATE Bills SET Name = '#name', Time = '#time', Product = '#pro', Price = #money WHERE Name = '#value';");
using (SqlConnection con = new SqlConnection(connString))
{
con.Open();
using (SqlCommand cmd = new SqlCommand(sqlcmdString, con))
{
cmd.CommandType = CommandType.Text;
// define parameters
cmd.Parameters.Add("#name", SqlDbType.NVarChar, 100).Value = tb_TenKH.Text;
cmd.Parameters.Add("#time", SqlDbType.DateTime).Value = cb_Thoigian.Text;
cmd.Parameters.Add("#pro", SqlDbType.NVarChar, 100).Value = tb_SanPham.Text;
cmd.Parameters.Add("#money", SqlDbType.Money).Value = tb_ThanhTien.Text;
cmd.Parameters.Add("#value", SqlDbType.NVarChar, 100).Value = cellvalue;
if (cmd.ExecuteNonQuery() > 0)
{
MessageBox.Show("Thành Công!!!");
if (passrow != null)
{
string[] result_back = { tb_TenKH.Text, cb_Thoigian.Text, tb_SanPham.Text, tb_ThanhTien.Text };
passrow(result_back);
{
this.Hide();
}
}
}
else
{
MessageBox.Show("Thất Bại!!!");
}
con.Close();
}
}