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i find the below error in my mvc project, i get error in open connection line
System.ComponentModel.Win32Exception: The system cannot find the file specified

What I have tried:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.SqlClient;
using Vipadm.ViewModals;
namespace Vipadm.Models
    public class DBConn
        //SqlConnection con = new SqlConnection(@"Data Source=DESKTOP-PNV2C7S; Database=RI400;integrated security=true");
        SqlConnection con = new SqlConnection("Data Source=DESKTOP-PNV2C7S\SQLEXPRESS;Initial Catalog=RI400;User ID=sa;Password=gajula");
        public void Clientdata(Client cl)
            SqlCommand cmd = new SqlCommand("insert into clients(ClientName,VATNumber,Address1) values(@ClientName,@VATNumber,@Address1)", con);
            cmd.Parameters.AddWithValue("@VATNumber", cl.VATNumber);
            cmd.Parameters.AddWithValue("@Address1", cl.Address1);
ZurdoDev 4-Jan-18 7:21am    
con.Open() is the line that causes that error?
Richard MacCutchan 4-Jan-18 7:24am    
The system cannot find the file. This message could not be clearer.
F-ES Sitecore 4-Jan-18 7:49am    
Use SQL Management Studio to see if you can connect to DESKTOP-PNV2C7S\SQLEXPRESS, the database might not be configured properly.

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