Hello, Ahmed, 

I would recommend you to bind your RadGridView to the data table that you have in the SQL server: https://docs.telerik.com/devtools/winforms/controls/gridview/populating-with-data/tutorial-binding-to-datatable-or-dataset 

For this purpose you can use the RadGridView's "Data Source Configuration Wizard" from the above referred documentation article and select the Microsoft SQL Server (Sql Client) option to bind the data table to RadGridView.

After interacting with RadGridView at run time, you can save the changes from RadGridView back to the database by using one of the demonstrated approaches here: https://docs.telerik.com/devtools/winforms/controls/gridview/populating-with-data/updating-the-database-with-ado.net   
 
I hope this information helps. If you need any further assistance please don't hesitate to contact me. 

Regards,
Dess | Tech Support Engineer, Sr.
Progress Telerik

this is my approach but it doesn't work what i need to change in my code ?? 

 

 

                    foreach (GridViewRowInfo rowInfo in radGridView1.Rows)
                    {

                        MemoryStream stream = new MemoryStream();


                        foreach (GridImageCellElement cell in rowInfo.Cells)
                        {
                            if (cell.Image != null)
                            {
                                Image image1 = GetImageFromBytes(rowInfo.Cells[2].Value as byte[]);

                                image1.Save(stream, System.Drawing.Imaging.ImageFormat.Jpeg);
                            }
                        }



                        byte[] pic = stream.ToArray();

                        sql1 = "INSERT INTO customersdocs([custnumber],[custname],[number],[name],[doc])VALUES(@custnumber,@custname,@number,@name,@doc)";
                        cm.CommandText = sql1;
                        cm.Parameters.Clear();
                        cm.Parameters.AddWithValue("@custnumber", radLabel4.Text);
                        cm.Parameters.AddWithValue("@custname", radTextBox3.Text);
                        cm.Parameters.AddWithValue("@number", rowInfo.Cells[0].Value.ToString());
                        cm.Parameters.AddWithValue("@name", rowInfo.Cells[1].Value.ToString());
                        cm.Parameters.AddWithValue("@doc", pic);
                        cm.ExecuteNonQuery();
                    }

Hi, Ahmed,

According to the provided code snippet, it seems that you are iterating the rows in RadGridView and try to save the cell's value (that stores the image byte[]) to an Image and then to a file. To be honest, this question is not directly related to RadGridView. That is why I have researched in general programming forums on this topic and found the following threads which seem to be useful for your case:
https://social.msdn.microsoft.com/Forums/vstudio/en-US/c3ab095f-ca57-4aa3-8ca7-e22c65b3b7bd/c-how-to-get-image-from-array-of-bytes-blob-converted-into-array-of-bytes?forum=csharpgeneral 

https://stackoverflow.com/questions/9173904/byte-array-to-image-conversion 

Please give them a try and see how they would work for your case.

I hope this information helps. 

Regards,
Dess | Tech Support Engineer, Sr.
Progress Telerik