TextBox - Object Reference Not Set To An Instance of an Object

Question

I have a very simple piece of code that is throwing an unexpected error and I am struggling to understand what could possibly be wrong.

private void dataNames_CellDoubleClick(object sender, DataGridViewCellEventArgs e) 
{   
    DataGridViewRow row = dataNames.CurrentCell.OwningRow;
    string val = row.Cells["Name"].Value.ToString();
    txtName.Text = val;
}

The Object dataNames is a DataGridView with only a single Column in it called Names.

When I double click a Name from the Grid I want it to populate the Textbox (txtName)

I fail to see how a Textbox can produce an 'Object not set . . ' error when all I am doing is posting a value to its Text property. When I step through the string 'val' does pick up the correct value from the DataGridView.

Your code suggests the column is "Name" but your description suggests it is "Names" — Claies
– Claies, Commented Jan 2, 2014 at 11:58
Where "txtName" textbox is exactly located ? Inside the grid or outside the grid ? — mit
– mit, Commented Jan 2, 2014 at 12:05

PJW · Accepted Answer · 2014-01-02 12:03:22Z

1

Ironically, having spent a good while unable to find the problem, I go and spot it straight after posting the question.

The error is earlier in the Form_Load event, which calls a custom ClearForm method, which blanks all text fields on the form. However I had done the following :-

txtTitle.Text = null;
txtAge.Text = null;
txtName = null;

Hence I set the textbox itself = null, rather than its text property.

Sometimes the simplest of typos produces the most puzzling of errors!

answered Jan 2, 2014 at 12:03

PJW

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