Protected Sub C1GridView1_Sorted(ByVal sender As Object, ByVal e As EventArgs)
　　C1GridView1.DataSource = GetData
　　C1GridView1.DataBind
End Sub
　　
Public Function GetData() As DataTable
　　Dim dt = New DataTable
　　・・・
　　Return dt
End Function

protected void C1GridView1_Sorted(object sender, EventArgs e)
{
　　C1GridView1.DataSource = GetData();
　　 C1GridView1.DataBind();
}

public DataTable GetData()
{
　　var dt = new DataTable();
　　・・・
　　return dt;
}

Protected Sub C1GridView1_Sorting(ByVal sender As Object, ByVal e As C1.Web.Wijmo.Controls.C1GridView.C1GridViewSortEventArgs)
　　Dim data = GetData
　　If (e.SortDirection = C1.Web.Wijmo.Controls.C1GridView.C1SortDirection.Ascending) Then
　　　　data = data.OrderBy(() => {　}, p.No).ToArray
　　ElseIf (e.SortDirection = C1.Web.Wijmo.Controls.C1GridView.C1SortDirection.Descending) Then
　　　　data = data.OrderByDescending(() => {　}, p.No).ToArray
　　End If
　　　　
　　C1GridView1.DataSource = data
　　C1GridView1.DataBind
End Sub

Public Function GetData() As IEnumerable(Of Test)
　　Dim data1 = New Test() With {.No = 1, .Name = "AAA"}
　　Dim data2 = New Test() With {.No = 2, .Name = "BBB"}
　　Dim data3 = New Test() With {.No = 3, .Name = "CCC"}
　　Return {data1, data2, data3}
End Function

protected void C1GridView1_Sorting(object sender, C1.Web.Wijmo.Controls.C1GridView.C1GridViewSortEventArgs e)
{
　　var data = GetData();
　　if (e.SortDirection == C1.Web.Wijmo.Controls.C1GridView.C1SortDirection.Ascending)
　　{
　　　　data = data.OrderBy(p => p.No).ToArray();
　　}
　　else if (e.SortDirection == C1.Web.Wijmo.Controls.C1GridView.C1SortDirection.Descending)
　　{
　　　　data = data.OrderByDescending(p => p.No).ToArray();
　　}

　　C1GridView1.DataSource = data;
　　C1GridView1.DataBind();
}

public IEnumerable GetData()
{
　　var data1 = new Test() { No = 1, Name = "AAA" };
　　var data2 = new Test() { No = 2, Name = "BBB" };
　　var data3 = new Test() { No = 3, Name = "CCC" };

　　return new[] { data1, data2, data3 };
}