How to add rdlc reports to winform project with out throwing any error

Question

Hi,
I have been trying to resolve this problem in all ways.I am working on win forms in VS 2010 using C#.I have designed 4 rdlc reports in a copy of same projects, and now I have been trying to add those rdlc reports to main project(same name of 2 projects).
They are adding but throwing an error as "A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible.Verify that the instance name is correct and that
SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified) "
at 
private void report10th_Load(object sender, EventArgs e)
// TODO: This line of code loads data into the 'dataset10th.attendance' table. You can move, or remove it, as needed.
this.attendanceTableAdapter.Fill(this.dataset10th.attendance);//throws an error here
// TODO: This line of code loads data into the 'dataset10th.regestration' table. You can move, or remove it, as needed.
this.regestrationTableAdapter.Fill(this.dataset10th.regestration);
// TODO: This line of code loads data into the 'dataset10th.tenthclass_marks' table. You can move, or remove it, as needed.
this.tenthclass_marksTableAdapter.Fill(this.dataset10th.tenthclass_marks);
//this.reportViewer1.RefreshReport();
please Help me out how to add these RDLC reports to win forms 

Answer 1

Thank you for replaying me sir,
Finally i got to know the answer through your instructions.
I have a look into app.config file and replaced the server name as 
<add name="f2.Properties.Settings.smssmsConnectionString" connectionString="Data Source=User-pc\sqlexpress;Initial Catalog=smssms;Integrated Security=True"
providerName="System.Data.SqlClient" />
//to
<add name="f2.Properties.Settings.smssmsConnectionString" connectionString="Data Source=.;Initial Catalog=smssms;Integrated Security=True"
providerName="System.Data.SqlClient" />