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Suggestion 1
In order to update the selected value in second grid, you can use the PopulateValues method in SelectionChanged event. Please refer to the below code example,
Code example
this.gridControl1.SelectionChanged += gridControl1_SelectionChanged;
void gridControl1_SelectionChanged(object sender, GridSelectionChangedEventArgs e)
{
this.gridControl2.ColCount = this.gridControl1.ColCount;
this.gridControl2.RowCount = e.Range.Height;
DataTable table = new DataTable();
foreach(DataColumn column in dt.Columns)
{
table.Columns.Add(column.ColumnName);
}
for (int j = 0; j < e.Range.Height; j++)
{
DataRow dr = table.NewRow();
for (int i = 0; i < this.gridControl1.ColCount; i++)
{
dr[i] = this.gridControl1[e.Range.Top + j, i+1].CellValue;
}
table.Rows.Add(dr);
}
this.gridControl2.PopulateValues(GridRangeInfo.Cells(1, 1, this.gridControl2.RowCount, this.gridControl2.ColCount),table);
this.gridControl2.Refresh();
} | 
