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I need to read one text file from layouts folder and need to write that file in sharepoint document library, I tried c# file stream file.openread and file.writeopen it's working for local files. I am not sure how to write the files in the sharepoint document library or some other Sharepoint URL path. Please suggest some idea to achieve this.

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To write file in document library you can use the below code, that using the FileCreationInformation

FileCreationInformation createFile = new FileCreationInformation();
createFile.Url = "testFile.txt";
//Read the file and convert it into byte array to set content of the file
string somestring = "File content";
byte[] toBytes = Encoding.ASCII.GetBytes(somestring);
createFile.Content = toBytes; 

List spList = context.Web.Lists.GetByTitle("Documents");
Microsoft.SharePoint.Client.File addedFile = spList.RootFolder.Files.Add(createFile);
context.Load(addedFile);
context.ExecuteQuery();

ListItem item = addedFile.ListItemAllFields;
item["Title"] = "File created";
item.Update();
ctx.Load(item);
ctx.ExecuteQuery();

Console.WriteLine("File created");

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