Cannot save empty text box value to database.(format is in int)

Replace

 objMEndorsement.BankRegion =  Convert.ToInt32(txtBankRegion.Text);
 objMEndorsement.CostCenter = Convert.ToInt32(txtCostCenter.Text);

by

 objMEndorsement.BankRegion =  Convert.ToInt32(txtBankRegion.Text??0);
 objMEndorsement.CostCenter = Convert.ToInt32(txtCostCenter.Text??0); 

?? is null coalesce operator in c#

EDIT: Best option would be to use tryParse like this

bool isInteger=int.TryParse(txtBankRegion.Text??0, out num1);
if(isInteger)
{
//insert into database
}

Try to use int.TryParse() this is better in handling conversion.

You can do it this way:

int bankRegion = 0; //Default value if wasn't able to parse
int.TryParse( txtBankRegion.Text, out value );
objMEndorsement.BankRegion = bankRegion;

Then you can do the same with the other field.

Make objMEndorsement.BankRegion NULLable and:

if(!string.IsNullOrWhiteSpace(txtBankRegion.Text))
    objMEndorsement.BankRegion =  Convert.ToInt32(txtBankRegion.Text)

(This works if NULL is the initial value of the property objMEndorsement.BankRegion = Convert.ToInt32(txtBankRegion.Text))

Otherwise (property still have to accept NULL):

objMEndorsement.BankRegion = string.IsNullOrWhiteSpace(txtBankRegion.Text) ? null : Convert.ToInt32(txtBankRegion.Text);

Remember that your database field must be NULLable also (otherwise you will get a DB error when trying to persist NULL).

make it nullable type by converting the value type to nullable type and then send it to database

yes use ternary operator and assign corresponding values objMEndorsement.BankRegion = (txtBankRegion.Text.trim()) ? 0 : Convert.ToInt32(txtBankRegion.Text)