saving images after editing,that time saving only last edited images in winform appli

[jaseem0712]

i have a data grid view like this:
in cell content click i wrote code like this:

If e.ColumnIndex = 4 Then
            Dim OFDLogo As New OpenFileDialog()
            OFDLogo.Filter = "JPEG(*.jpg)|*.jpg|BMP(*.bmp)|*.bmp"
            If OFDLogo.ShowDialog() = DialogResult.OK Then
                gv.Rows(e.RowIndex).Cells(4).Value = Image.FromFile(OFDLogo.FileName)
            End If
        End If

and save button i wrote code like this:

Dim cmpny As String = "Delete from CompanyMaster_tbl"
        Exetransaction(cmpny)
    For i As Integer = 0 To gv.RowCount - 2
     sqlInsertT2 = "Insert Into DepartmentMaster_tbl(dtname,dtphone,dtEmail,Cid) Values ('" + myTI.ToTitleCase(gv.Rows(i).Cells(1).Value) + "','" + gv.Rows(i).Cells(2).Value + "','" + gv.Rows(i).Cells(3).Value + "'," & Ccid & ");"
                    Exetransaction(sqlInsertT2)
                    Dim departmnt As String = gv.Rows(i).Cells(1).Value
 
                    Dim departid As Integer = RecordID("dtId", "DepartmentMaster_tbl", "dtName", departmnt)
                    Dim sql As String
 
                    '----------------------------------
 
                    Dim image As Image = TryCast(gv.Rows(i).Cells(4).Value, Image)
                    If image IsNot Nothing Then
                        Dim ms As New MemoryStream()
                        image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif)
                        Dim imagedata As Byte() = ms.ToArray()
                        sql = "update DepartmentMaster_tbl set empimage=@photo where dtId='" & departid & "'"
                        Dim cmd As New SqlCommand(sql, con.connect)
                        cmd.Parameters.Add("@photo", SqlDbType.Image)
                        cmd.Parameters("@photo").Value = imagedata
                        cmd.ExecuteNonQuery()
                        con.disconnect()
                    End If
     Next

In first time I try to save this,saving both images, after loading the same page again I edited one image and I try to save, but that time only saving edited image What is wrong with my code?
In cell content click I am taking row_index