Hello Sir,

I have already passed the dtaa source but then also im getting this error .

Getting this error: A data source instance has not been supplied for the data source DataSet1.

please help me out.

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            string com = "select client_Id,preferredname from client where rowstate=1 ";
            SqlDataAdapter adpt = new SqlDataAdapter(com, con);
            DataTable dt = new DataTable();
            adpt.Fill(dt);
            DropDownList4.DataSource = dt;
            DropDownList4.DataBind();
            DropDownList4.DataTextField = "preferredname";
            DropDownList4.DataValueField = "client_Id";
            DropDownList4.DataBind();
            DropDownList4.Items.Insert(0, new ListItem("------Select Client-----", "0"));
        }
    }
    protected void btn1_Click(object sender, EventArgs e)
    {
        ReportViewer1.Visible = true;
        int id = Convert.ToInt32(txtID.Text);
        ReportViewer1.ProcessingMode = ProcessingMode.Local;
        ReportViewer1.LocalReport.ReportPath = Server.MapPath("~/report.rdlc");
        DataSet ds = new DataSet();
        ds = GetData(id);
        if (ds.Tables[0].Rows.Count > 0)
        {
            ReportViewer1.Reset();

            ReportDataSource rds = new ReportDataSource("DataSet1", ds.Tables[0]);
            ReportViewer1.LocalReport.DataSources.Clear();
            ReportViewer1.LocalReport.DataSources.Add(rds);
        }
    }

    private DataSet GetData(int id)
    {
        con.Open();
        SqlCommand cmd = new SqlCommand("select * from client where client_Id=" + id + " and rowstate=1");
        using (con)
        {
            using (SqlDataAdapter da = new SqlDataAdapter())
            {
                cmd.Connection = con;
                da.SelectCommand = cmd;
                DataSet ds = new DataSet();
                da.Fill(ds);
                return (ds);
            }
        }
    }

    protected void DropDownList4_SelectedIndexChanged(object sender, EventArgs e)
    {
        txtID.Visible = true;
        String strQuery = "select client_Id,preferredname from client   where" +
                          " client_Id = @client_Id and rowstate=1";

        SqlCommand cmd = new SqlCommand();
        cmd.Parameters.AddWithValue("@client_Id", DropDownList4.SelectedItem.Value);
        cmd.CommandType = CommandType.Text;
        cmd.CommandText = strQuery;
        cmd.Connection = con;
        try
        {
            con.Open();
            SqlDataReader sdr = cmd.ExecuteReader();
            while (sdr.Read())
            {
                txtID.Text = sdr[0].ToString();
            }
        }
        catch (Exception ex)
        {
            throw ex;
        }
        finally
        {
            con.Close();
            con.Dispose();
        }