我正在尝试在以下情况下将“txtMiles”文本框设置为焦点:
- 表单打开时
- 单击“清除”按钮时
我尝试使用 txtMiles.Focus();
,但似乎对我没有用。
在此表单上使用的代码
private void btnConvert_Click(object sender, EventArgs e)
{
//assigns variable in memory.
double txtMile = 0;
double Results;
try
{
// here is where the math happens.
txtMile = double.Parse(txtMiles.Text);
Results = txtMile * CONVERSION;
lblResults.Text = Results.ToString("n2");
txtMiles.Focus();
}
// if the user enters an incorrect value this test will alert them of such.
catch
{
//MessageBox.Show (ex.ToString());
MessageBox.Show("You entered an incorrect value");
txtMiles.Focus();
}
}
private void btnClear_Click(object sender, EventArgs e)
{
//This empties all the fields on the form.
txtMiles.Text = "";
txtMiles.Focus();
lblResults.Text = "";
}
private void btnExit_Click(object sender, EventArgs e)
{
// closes program
this.Close();
}
}
}
Thanks in advance for the help.