not all code pathes return value

		public bool bindToDatGrid(int x)

		{

			try

			{

				SqlConnection cnn = new 

					SqlConnection("server=(local);uid=sa;p  wd=yaali;database=MDB" );



				SqlDataAdapter sqlDataAdapter1 = new  

					SqlDataAdapter("select * from tblPictures",cnn); 			

				

				sqlDataAdapter1.SelectCommand.CommandText = "Select * From tblPictures id = "

					+            Convert.ToString(x);



				DataSet ds = new DataSet();

				sqlDataAdapter1.Fill(ds, "tblPictures");

				

				DataGrid1.DataSource =  ds.Tables["tblPictures"].DefaultView;

				DataGrid1.DataBind();

				

				if (ds.Tables[0].Rows.Count == 0)

					return false;



				// populate the hidden answers: 			

				//  now we need to get the picture from the DataRow

				//  and assign it to a byte array



				byte[] MyData =null;

				MyData = (byte[])ds.Tables[0].Rows&  #91;0]["Image"];



				int ArraySize = new int();

				ArraySize = MyData.GetUpperBound(0);



				//  Create a Filestream for writing the byte array to a gif file (the original format in this case)

				FileStream fs = new FileStream("web.gif", FileMode.OpenOrCreate, FileAccess.Write);



				//  Write the stream of data that we read in from the database to the filestream and close it.

				//  This will create the file  tmp.gif, which we can use to display in the picturebox



				fs.Write(MyData, 0,ArraySize+1); // don't ask me why, but I had to add 1 here for this to work

				fs.Close();



				//  Assign the temporary gif file to the picture box



				//pictureBox1.Image = new Bitmap("web.gif");

				Image1.ImageUrl= new Bitmap("Web.Gif").ToString();

				return true;				

			}

			catch (Exception ex)

			{				

				Response.Write(ex.Message.ToString()&#  41;;				

			}



		}

کد فوق جهت خواندن داده از بانک اسکیوئل برای نمایش عکس است:

d:\inetpub\wwwroot\InsertImage\WebForm1.aspx.c  s(55): 'InsertImage.WebForm1.bindToDatGrid(int)'&  #58; not all code paths return a value

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[tblPictures&#93  ;') and OBJECTPROPERTY(id, N'IsUserTable') = 1)

drop table [dbo].[tblPictures]

GO



CREATE TABLE [dbo].[tblPictures] (

	[id] [int] NOT NULL ,

	[Image] [varbinary] (50) NULL 

) ON [PRIMARY]

GO

شما از try و catch استفاده کرده اید و نوع تابع شما هم bool است. در بدنه ی try و یا در بدنه ی catch باید حتما true و یا false بر گردانده شود تا تابع خروجی داشته باشد.