我编写了一个代码,其中当单击一个复选框时,其他复选框被取消选中
按钮图像
我的 3 个复选框按名称、包含和按日期工作正常但是当我尝试对按类别复选框执行相同操作时,我得到以下消息。错误图片
这是我的代码
private void vieworder_Load(object sender, EventArgs e)
{
try
{
con.Open();
if (con.State == ConnectionState.Open)
{
lblstatus.Text = "Connected";
lblstatus.ForeColor = Color.Green;
}
else
{
lblstatus.Text = "Not-Connected";
lblstatus.ForeColor = Color.Red;
}
showdtgrid();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
private void hidecheckbox()
{
chkboxbyname.CheckState = CheckState.Unchecked;
chkboxbydate.CheckState = CheckState.Unchecked;
chkboxcontaining.CheckState = CheckState.Unchecked;
checkBox1.CheckState = CheckState.Unchecked;
}
private void chkboxbyname_CheckedChanged(object sender, EventArgs e)
{
hidecheckbox();
chkboxbyname.CheckState = CheckState.Checked;
}
private void chkboxcontaining_CheckedChanged(object sender, EventArgs e)
{
hidecheckbox();
chkboxcontaining.CheckState = CheckState.Checked;
}
private void chkboxbydate_CheckedChanged(object sender, EventArgs e)
{
hidecheckbox();
chkboxbydate.CheckState = CheckState.Checked;
}
private void checkBox1_CheckedChanged(object sender, EventArgs e)
{
hidecheckbox();
checkBox1.CheckState = CheckState.Checked;
}
}
}
请告诉我怎么了