retrieve images in picture box

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I have a small isssure when I am going thru dgv with Image column and I need to change images in picture box beside dgv

I have this code on form_load and dgID_textchanged

C#

if (image1.Image != null)
    image1.Image.Dispose();


SqlCommand cmd22 = new SqlCommand("Image_proc", cs);
cmd22.CommandType = CommandType.StoredProcedure;
cmd22.Parameters.Add("@imgId", SqlDbType.Int).Value =
          Convert.ToInt32(dgID.Text);
SqlDataAdapter adp = new SqlDataAdapter(cmd22);
DataTable dt = new DataTable();

try
{
    if (cs.State == ConnectionState.Closed)
        cs.Open();
    adp.Fill(dt);
    if (dt.Rows.Count > 0)
    {


        MemoryStream ms = new MemoryStream((byte[])dt.Rows[0]["Image"]);

        image1.Image = Bitmap.FromStream(ms);

        image1.Refresh();
    }

}
catch (Exception ex)
{
    MessageBox.Show(ex.Message, "Error",
          MessageBoxButtons.OK, MessageBoxIcon.Error);
}
finally
{
    if (cs.State == ConnectionState.Open)
        cs.Close();
}

it all works great when there is a image in the cell of dgv but whene it is null value then I get Error Unable to cast object of type 'System.DBNull' to type 'System.Byte ... and I am stuck

[edit]Code block added - OriginalGriff[/edit]

Posted 22-Jun-13 4:58am

shonezi

Updated 22-Jun-13 5:11am

OriginalGriff

v2

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OriginalGriff · Accepted Answer · 2013-06-22T05:14:00

Solution 1

Simple - check it.

C#

if (dt.Rows.Count > 0)
    {
    object o = dt.Rows[0]["Image"];
    Image im = null;
    if (o != DBNull.Value)
        {
        MemoryStream ms = new MemoryStream((byte[])o);
        im = Bitmap.FromStream(ms);
        }
    image1.Image = im;
    image1.Refresh();
    }

Posted 22-Jun-13 5:14am

OriginalGriff

Comments

shonezi 22-Jun-13 11:25am

now I get error on im = Bitmap.FromStream(ms) Cannot implicitly convert System.DrawingImage to User.Image

and on image1.Image = im I get cannot implicitly convert User.Image to System.drawing.Image :D :D :D

OriginalGriff 22-Jun-13 11:28am

Then change the types to match your code...
(Or preferably don't define classes with the same name as common .NET Framework classes)