Populate Gridview Using Web Services in C# winforms

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C#3.0

C#

DataGrid

webservice

I have make one webserive which have code of this

static SqlConnection conn = new SqlConnection(ConfigurationSettings.AppSettings["Connection"].ToString());

[WebMethod] public DataSet SQLBranchMaster() {

    String Load = "SELECT * FROM BranchMaster";
    conn.Open();
    SqlDataAdapter adapt = new SqlDataAdapter(Load,conn);
    DataSet ds = new DataSet();
    adapt.Fill(ds);
    conn.Close();
    return ds;

}

now on windows forms my code is

dataGridView1 = new DataGridView();

// Service is my Webserive class name
// myservice is my reference added in the Winforms

        myservice.Service test = new myservice.Service();
        dataGridView1.DataSource = test.SQLBranchMaster();

how to do now ? nothing shown when i run the form