problem to remove single marker in google maps api

[C# Programming]

in my example it's show that I put only one marker but lets say I add much more markers and I only want to remove marker in my array in index 0.
protected void CheckBox1_CheckedChanged(object sender, EventArgs e) { if (CheckBox1.Checked == true) { GMap1.addGMarker(markers1[0]); } else { //i dont know what to write here } }