DICOM-bestanden opslaan en ophalen in SQL Server met C#

Declareer byte[] objData buiten en voordat je blok gebruikt en probeer grootte in te stellen van byte-array:

byte []objData=null;
using (MemoryStream memStream = new MemoryStream())
 {
    using (FileStream fileStream = File.Open(txtDICOMFilePath.Text, FileMode.Open))
    {
         fileStream.CopyTo(memStream);
    }
    int intL = Convert.ToInt32(memStream.Length);
    objData = new byte[intL];
    memStream.Read(objData,0,objData.Length);
 }

SqlCom.Parameters.Add("@ImageData",SqlDb.Image,objData.Length).Value=objData;

EDIT:om gegevens te lezen van ImagesStore

string qry = "select * From ImagesStore";

using(SqlConnection Cn=new SqlConnect(CnStr))
{
  using(SqlCommand SqlCom = new SqlCommand(qry, CN))
  {
    Cn.Open();
    using(SqlDataReader dr=SqlCom.ExecuteReader())
    {
      while(dr.Read())
      {
          string path="x:\\folder\\" + dr[0] + ".png";
          byte []bytes=(byte[])dr[1];
          System.IO.File.WriteAllBytes(path,bytes);
       }
    }
  }
}

Als alternatief kunt u DataAdapter/DataTable (code in OP) gebruiken

if (dt.Rows.Count > 0)
     {
        foreach(DataRow row in dt.Rows)
         {
          string path="x:\\folder\\" + row[0] + ".png";
          byte []bytes=(byte[])row[1];
          System.IO.File.WriteAllBytes(path,bytes);
         }
     }