How to display a cell values in UpperCase in WinForms DataGrid (SfDataGrid)?
WinForms DataGrid (SfDataGrid) allows you to display the record data in upper case for a specific column by using SfDataGrid.DrawCell event
public Form1()
{
InitializeComponent();
this.sfDataGrid1.DrawCell += OnSfDataGrid1_DrawCell;
}
private void OnSfDataGrid1_DrawCell(object sender, Syncfusion.WinForms.DataGrid.Events.DrawCellEventArgs e)
{
if(e.Column.MappingName == "ProductName")
{
e.DisplayText = e.DisplayText.ToUpper();
}
}

Take a moment to peruse the documentation, where you can find about conditional styling in SfDataGrid, with code examples.
You can download the example from GitHub