how to update a existing image from my website?

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Hai

I want to update a database image from my website. in my web page i have file upload, dropdownlist,one button field. this is my code..

C#

protected void Button1_Click(object sender, EventArgs e)
   {
       if (FileUpload1.PostedFile != null && FileUpload1.PostedFile.FileName != "")
       {
           byte[] imagesize = new byte[FileUpload1.PostedFile.ContentLength];
           HttpPostedFile uploadedImage = FileUpload1.PostedFile;
           uploadedImage.InputStream.Read(imagesize, 0, (int)FileUpload1.PostedFile.ContentLength);
           SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["wavoo"].ConnectionString);
           con.Open();
           int i =Convert.ToInt32(DropDownList1.SelectedItem.Text);
           SqlCommand cmd = new SqlCommand("update picture set image=@image  where ID=" + i, con);
           SqlParameter param = new SqlParameter("@Image", SqlDbType.Image, imagesize.Length);
           cmd.Parameters.Add(uploadedImage);
           cmd.ExecuteNonQuery();
           MessageBox.Show("sdfdf");

       }
   }

actually i don't know about parameters... and my error is

The SqlParameterCollection only accepts non-null SqlParameter type objects, not HttpPostedFile objects.

Please help me

Posted 14-Aug-12 21:23pm

Member 9327701

Updated 14-Aug-12 21:24pm

StianSandberg

v2

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2 solutions

Solution 2

Your passing parameter is incorrect. You created param parameter but adding uploadedImage to the command cmd.

Instead of this.

C#

SqlParameter param = new SqlParameter("@Image", SqlDbType.Image, imagesize.Length);
           cmd.Parameters.Add(uploadedImage);

try,

C#

SqlParameter param = new SqlParameter("@Image", SqlDbType.Image, imagesize);
           cmd.Parameters.Add(param );

Posted 14-Aug-12 21:47pm

Santhosh Kumar Jayaraman

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StianSandberg · Accepted Answer · 2012-08-14T21:26:00

Solution 1

You can't send HttpPostadFile as a parameter value to your database. You will have to convert it to a bytearray first.

This article explains everything you'll need to know:
C# Save and Load Image from Database[^]

Posted 14-Aug-12 21:26pm

StianSandberg

Comments

Member 9327701 15-Aug-12 3:41am

Thank You so much i got the answer..

Another one doubt..

my grid view doesn't display the data.. why...

StianSandberg 15-Aug-12 3:44am

I have no idea.. Could you post your code?