I want to insert selected image into database

Question

public void BindImages()
{
try
{
string query = "select * from Images where Prod_id=@Id";
SqlCommand cmd = new SqlCommand(query, EcomConString);
cmd.Parameters.AddWithValue("@Id", SqlDbType.VarChar).Value = id;
cmd.CommandType = CommandType.Text;
SqlDataAdapter sda = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
sda.Fill(dt);
if (dt.Rows.Count > 0)
{
foreach (DataRow dr in dt.Rows)
{
strImages += @"<li><img src='/" + dr["Img"] + @"'  class='img-thumbnail' alt=''  /></li>";strThumbImage += dr["Img"].ToString() + ",";
}
}
}
catch (Exception ex) { }
}