DataGridViewCheckBoxCell cant be unchecked ?!

this.dgv_configCH.CellClick += new System.Windows.Forms.DataGridViewCellEventHandler(this.dgv_configCH_CellClick_1)

private void dgv_configCH_CellClick_1(object sender, DataGridViewCellEventArgs e)

{

if (e.RowIndex > -1)

{

if ( e.ColumnIndex == 1 )

{

string l_tmpMode = _model_Channel;

_model_Channel = "";

string l_value = dgv_configCH[e.ColumnIndex, e.RowIndex].Value.ToString();

int l_xch = e.RowIndex + 1;

if (l_value == "True")

{

_producer.RunCmd("En:" + l_xch.ToString() + ",0");

// dgv_configCH[e.ColumnIndex, e.RowIndex].Value = false;

}

else if (l_value == "False")

{

_producer.RunCmd("En:" + l_xch.ToString() + ",1");

// dgv_configCH[e.ColumnIndex, e.RowIndex].Value = true;

}

_model_Channel = l_tmpMode;

}

}

}

 

I tried all the other events(dirty cell, mouseup,...) No one works. I'm on this problem for about 12 hours. Please help please please please help. I'm dying. I just want this checkbox to work normally omg.