How to update a dataset

Question

In my project, there are two textBoxes, txtName and txtPopulation and a Button, btnClick. whenever the user clicks btnClick

Answer 1

You need to call .AcceptChanges() on your DataTable so your changes are committed to the collection, like this:

for (int intCount = 0; intCount < dsDetails.Tables[0].Rows.Count; intCount++)
{
    if (lblCountryName.Text.Equals(dsDetails.Tables[0].Rows[intCount][0].ToString()))
    {
        dsDetails.Tables[0].Rows[intCount][3] = txtPopulation.Text;
    }
}  

dsDetails.Tables[0].AcceptChanges();

Using select row filter

You can target your column by using the .Select row filter, like this:

foreach (DataRow row in dsDetails.Tables[0].Select("Name = '" + txtName.Text + "'"))
{
    row[3] = txtPopulation.Text;
}

dsDetails.Tables[0].AcceptChanges();