Why am I not able to send data to SQL server?

I am trying make an application which when installed in other system, has to collect details and send to my SQL server.

In SQL Server, I have made all columns as varchar(70).
I thought the problem was with datatypes, so I decided to remove OSInstallDate and  
LastBootUpTime in the below code and check. But still other data are not being inserted.
There is no problem with sql connection as I have checked it already.

If there's any other way of collecting all these data and sending to my database, I would be interested.

SelectQuery Sq1 = new SelectQuery("Win32_OperatingSystem");
                ManagementObjectSearcher objOSDetails1 = new ManagementObjectSearcher(Sq1);
                foreach (ManagementObject mo1 in objOSDetails1.Get())
                {
                    OperatingSystem = mo1["caption"].ToString();
                    ServicePack = mo1["csdversion"].ToString();
                    OSVersion = mo1["version"].ToString();
                    OSArchitecture = mo1["OSArchitecture"].ToString();
                   OSSno = mo1["serialnumber"].ToString();
                   OSInstallDate = mo1["InstallDate"].ToString();
                    OSDescription = mo1["Description"].ToString();
                    LastBootUpTime = mo1["LastBootUpTime"].ToString();
                    SPMajorVersion = mo1["ServicePackMajorVersion"].ToString();
                    RegUser = mo1["RegisteredUser"].ToString();
                    OSStatus = mo1["status"].ToString();
                }
                cmd1 = new SqlCommand("INSERT INTO [dbo].[OSInfo]([LastUpdatedOn],[IPAddress],[OperatingSystem],[ServicePack],[OSVersion],[OSArchitecture],[OSSno],[OSInstallDate],[Description],[LastBootUpTime],[SPMajorVersion],[RegUser],[OSStatus]) VALUES (getdate(),'" + IPA + "','" + OperatingSystem + "','" + ServicePack + "','" + OSVersion + "','" + OSArchitecture + "','" + OSSno + "','" + OSInstallDate + "','" + OSDescription + "','" + LastBootUpTime + "','" + SPMajorVersion + "','" + RegUser + "','" + OSStatus + "')", con);
                
                int numrows1 = cmd1.ExecuteNonQuery();