insert datarow in datatable if unique on multiple columns in csharp

main.cs
// Create a new DataTable
DataTable dataTable = new DataTable();

// Add columns to the DataTable
dataTable.Columns.Add("Column1", typeof(string));
dataTable.Columns.Add("Column2", typeof(int));
dataTable.Columns.Add("Column3", typeof(decimal));

// Create a new DataRow
DataRow newRow = dataTable.NewRow();
newRow["Column1"] = "Value1";
newRow["Column2"] = 123;
newRow["Column3"] = 45.67m;

// Check if the row is unique on columns "Column1" and "Column2"
DataRow[] foundRows = dataTable.Select("Column1 = 'Value1' AND Column2 = 123");

if (foundRows.Length == 0) // no matching rows found, insert the new row
{
    dataTable.Rows.Add(newRow);
}
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