how set Validation in Combobox

Accepted answer

Hi PK Singh,

Please use this one,

if (comboBox1.SelectedIndex == -1) //Nothing selected
{
MessageBox.Show("Please select any value", "Error");
}
else
{
//Do your logic for if any item selected in combobox
}

try this it will help you

https://www.aspsnippets.com/Articles/Validate-Check-ASPNet-DropDownList-using-JavaScript-and-jQuery.aspx

https://www.dotnetbull.com/2011/08/validating-dropdownlist-in-javascript.html

or

without javascript you can do as following

if (comboBox1.SelectedIndex == -1) // if combobox is not selected

{

MessageBox.Show("Please select any value from combobox", "Error");

}

else

{

//logic for if any item selected in combobox

}

Aman Gupta5y ago

https://docs.microsoft.com/en-us/office/vba/api/access.combobox.validationrule

or

https://stackoverflow.com/questions/18122484/validating-if-a-combobox-its-selectedtext-property-is-empty-always-fails/18122689