How I can call function with one parameter (DataGrid or DataGridComboBoxColumn)? [closed]

Look at the params parameter modifier.

public int Sum(params int[] integers)
{
    int sum=0;

    foreach (var x in integers)
    {
        sum += x;
    }

    return sum;
}

Usage

var sum = Sum(1,2,3,4) // 10

Also

var myArrayOfIntegers = new int[] {
    1,2,3,4
};

var sum = Sum(myArrayOfIntegers); // still 10