The Syncfusion® native Blazor components library offers 70+ UI and Data Viz web controls that are responsive and lightweight for building modern web apps.
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ADAdministrator Syncfusion Team June 24, 2005 04:37 PM UTC
Try setting the style.Borders.Bottom for the cells where you want to see the thicker lines.
this.gridControl1.TableStyle.Borders.Bottom = new GridBorder(GridBorderStyle.Solid, Color.Black, GridBorderWeight.Medium);