Check If All Values in a Column of a Gridview are the same

Hello guys I need your help again.

I have a gridview and one column has a boolean value. Now, If all rows in that column equals to TRUE, I will do my stuff.

protected void gvQuotationDetails_RowDataBound(object sender, GridViewRowEventArgs e)
{
if(e.Row.RowType == DataControlRowType.DataRow)
{
CheckBox cbNego = (CheckBox)e.Row.FindControl("cbNegotiate");
CheckBox cbApp = (CheckBox)e.Row.FindControl("cbApprove");
if (cbNego.Checked)
{
cbNego.Enabled = false;
}
if (cbApp.Checked)
{
cbApp.Enabled = false;
cbNego.Enabled = false;
}
// if all row values in cbApp == true,
//update quotation header
}
}

Thanks a lot.

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