Establezca fuente para MS Chart vb.net
chartName.ChartAreas("chartAreaName").AxisX.LabelStyle.Font = New System.Drawing.Font("Calibri", 11.0F, FontStyle.Bold)
VB.NETTER
chartName.ChartAreas("chartAreaName").AxisX.LabelStyle.Font = New System.Drawing.Font("Calibri", 11.0F, FontStyle.Bold)