C# DatagridView shows 0 columns

Question

I'm creating a DataGridView and using a DataTable to populate it.

My C#

DataGridView dgv = new DataGridView();
DataTable dt = new DataTable();

dt.Columns.Add("Col_1");
dt.Columns.Add("Col_2");

for(int i=0; i< myDictionary; i++)
{
  dt.Rows.Add(myDictionary.key, myDictionary.Value);
}

dgv.DataSource = dt;

for(int j=0; j < dgv.Columns.Count; j++)
{...} // this is where Count is always 0...

I'm really just looking to access the columns so that I can do something like

dgv.Columns[j].AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill;

Q: How can have the dataGridView reflect the columns properly?

score 0 · Answer 1 · answered Jun 02 '15 at 16:46

0

You have to set the property AutogenerateColumns to true:

dgv.AutogenerateColumns = true;
dgv.DataSource = dt;

answered Jun 02 '15 at 16:46

jcvegan

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I'm still not seeing any columns in the dgv – fifamaniac04 Jun 02 '15 at 16:50
are you using Winforms right? – jcvegan Jun 02 '15 at 16:56
yes i am; and i think that AutoGenerateColumns is default to true. in debugger, i see the value is true without assigning it – fifamaniac04 Jun 02 '15 at 16:58
the DataTable has data? – jcvegan Jun 02 '15 at 17:10
yes, If I run my code, i see the table with data, it's just that the width of the columns doesn't span the table – fifamaniac04 Jun 02 '15 at 17:11
Do you call DataBind() after setting DataSource? – Yuri Jun 02 '15 at 17:51

C# DatagridView shows 0 columns

1 Answers1