How to upload the files from local machine to Share point document library with metadata?

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C#

C#4.0

SharePoint

Hi,
i have windows application. i want to upload the files from local machine to sharepoint document library with metadata. here the metadata value should be entered into textbox. I have used the following coding but i got error "The remote server returned an error: (400) Bad Request." in context.ExecuteQuery(); this line.

private void btn_Upload_Click_1(object sender, EventArgs e)
{
public string Photos = Path.Combine(Path.GetDirectoryName(Application.ExecutablePath), "Photo");
string pathInf = Path.Combine(Photos,"Image.png");
ClientContext context = new ClientContext("http://Sharepointsite");
Web web = context.Web;
List list = web.Lists.GetByTitle("Shared Documents");
Microsoft.SharePoint.Client.FileCreationInformation fp1 = new FileCreationInformation();
fp1.Content = System.IO.File.ReadAllBytes(pathInf);
fp1.Url = "/Shared Documents/Scanning/" + "Image.png";
Microsoft.SharePoint.Client.File uploadFiles = list.RootFolder.Files.Add(fp1);
context.Load(uploadFiles);
context.ExecuteQuery();
ListItem items = uploadFiles.ListItemAllFields;
items["Custom1"] = textMetadata.Text;
items.Update();
context.ExecuteQuery();
}