In this post How to Upload Multiple Image and Save in Database Asp.Net

Important Namespaces Used
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using System.Data;
using System.Data.SqlClient;
using System.IO;

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Webconfig File Coding
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<httpRuntime targetFramework="4.6"

               executionTimeout="200"
               maxRequestLength="8192"
               requestLengthDiskThreshold="256"
               useFullyQualifiedRedirectUrl="false"
               minFreeThreads="8"
               minLocalRequestFreeThreads="4"
               appRequestQueueLimit="5000"
               enableKernelOutputCache="true"
               enableVersionHeader="true"
               requireRootedSaveAsPath="true"
               enable="true"
               shutdownTimeout="90"
               delayNotificationTimeout="5"
               waitChangeNotification="0"
               maxWaitChangeNotification="0"
               enableHeaderChecking="true"
               sendCacheControlHeader="true"
               apartmentThreading="false"/>

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static int photoid;

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Userdefined method Used
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public void getidno()
    {
        String mycon = "Data Source=sk-pc;Initial Catalog=ProfileDatabase;Integrated Security=True";
        SqlConnection scon = new SqlConnection(mycon);
        String myquery = "select sno from photodetail";
        SqlCommand cmd = new SqlCommand();
        cmd.CommandText = myquery;
        cmd.Connection = scon;
        SqlDataAdapter da = new SqlDataAdapter();
        da.SelectCommand = cmd;
        DataSet ds = new DataSet();
        da.Fill(ds);
        scon.Close();
        if (ds.Tables[0].Rows.Count < 1)
        {
            Label3.Text = "1001";
            photoid = 1001;

        }
        else
        {



            String mycon1 = "Data Source=sk-pc;Initial Catalog=ProfileDatabase;Integrated Security=True";
            SqlConnection scon1 = new SqlConnection(mycon1);
            String myquery1 = "select max(sno) from photodetail";
            SqlCommand cmd1 = new SqlCommand();
            cmd1.CommandText = myquery1;
            cmd1.Connection = scon1;
            SqlDataAdapter da1 = new SqlDataAdapter();
            da1.SelectCommand = cmd1;
            DataSet ds1 = new DataSet();
            da1.Fill(ds1);
            Label3.Text = ds1.Tables[0].Rows[0][0].ToString();
            int a;
            a = Convert.ToInt16(Label3.Text);
            a = a + 1;
            photoid = a;
            Label3.Text = a.ToString();
            scon1.Close();
        }

    }

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private void savedata(int sno1,String image1,String image2,String image3)
    {
        String updatepass = "insert into photodetail(sno,firstimage,secondimage,thirdimage) values(" + sno1 + ",'" + image1 + "','" + image2 + "','" + image3 + "')";
        String mycon1 = "Data Source=sk-pc;Initial Catalog=ProfileDatabase;Integrated Security=True";
        SqlConnection s = new SqlConnection(mycon1);
        s.Open();
        SqlCommand cmd1 = new SqlCommand();
        cmd1.CommandText = updatepass;
        cmd1.Connection = s;
        cmd1.ExecuteNonQuery();
        s.Close();
    }



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Pageload coding
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getidno();

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Upload and Save Button Click Event
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String fileextension;
        String photoname;
        String image1="";
        String image2="";
        String image3="";
        HttpFileCollection hfc = Request.Files;
        for (int i = 0; i < hfc.Count; i++)
        {
            HttpPostedFile hpf = hfc[i];
            if (hpf.ContentLength > 0)
            {
                fileextension = Path.GetExtension(hpf.FileName);
                photoname = photoid +""+ i + fileextension;
                
                hpf.SaveAs(Server.MapPath("UploadedImages") + "\\" + photoname);
                if(i==0)
                {
                    image1 = "UploadedImages\\" + photoname;
                }
                if (i == 1)
                {
                    image2 = "UploadedImages\\" + photoname;
                }
                if (i == 2)
                {
                    image3 = "UploadedImages\\" + photoname;
                }
            }
        }
        savedata(photoid, image1, image2, image3);
        Label4.Text = "Data Has Been Saved Successfully";
        getidno();

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