getting this error in the window application

Question

Index was out of range. Must be non-negative and less than the size of the collection.

Rajkiran Swain · Accepted Answer

The error says "The index is out of range". That means you were trying to index an object with a value that was not valid. If you have two books, and I ask you to give me your third book, you will look at me funny. This is the computer looking at you funny. You said - "create a collection". So it did. But initially the collection is empty: not only is there nothing in it - it has no space to hold anything. "It has no hands".

Adeel Ahmed · Answer

still getting error and my code is not working ..i am beggineer level and this is my assignment ..help me out brother..i want to transfer one gridview values to other gridview in same window frorm using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; using System.Data.SqlClient; namespace Lease_Managment_System12 { public partial class Sale_info : Form { SqlConnection con = new SqlConnection(@"Data Source=(localdb)\MSSQLLocalDB;Initial Catalog=lease managment;Integrated Security=True;Pooling=False"); //private DataGridView d; private int index; public Sale_info() { InitializeComponent(); } private void label2_Click(object sender, EventArgs e) { } private void Sale_info_Load(object sender, EventArgs e) { con.Open(); SqlCommand cmd = con.CreateCommand(); cmd.CommandType = CommandType.Text; cmd.CommandText = "SELECT [Name], [select_category], [sub_category], [company_name], [unit_price],[quantity] FROM product_info "; DataTable dt = new DataTable(); dt.Load(cmd.ExecuteReader()); SqlDataAdapter da = new SqlDataAdapter(cmd); da.Fill(dt); dataGridView1.DataSource = dt; con.Close(); } private void label3_Click(object sender, EventArgs e) { } private void textBox3_TextChanged(object sender, EventArgs e) { } private void textBox1_TextChanged(object sender, EventArgs e) { con.Open(); SqlCommand cmd = con.CreateCommand(); cmd.CommandType = CommandType.Text; cmd.CommandText = "select * from product_info where [Name] like('" + textBox1.Text + "%')"; DataTable dt = new DataTable(); dt.Load(cmd.ExecuteReader()); SqlDataAdapter da = new SqlDataAdapter(cmd); da.Fill(dt); dataGridView1.DataSource = dt; con.Close(); } private void pictureBox2_Click(object sender, EventArgs e) { } private void textBox4_TextChanged(object sender, EventArgs e) { } private void label4_Click(object sender, EventArgs e) { } private void label2_Click_1(object sender, EventArgs e) { } private void button1_Click(object sender, EventArgs e) { } private void dataGridView1_RowHeaderMouseClick(object sender, DataGridViewCellMouseEventArgs e) { //DataRow r = dataGridView1.Rows[e.RowIndex]; //Pass_To_Grid2(r); // Send to Other Grid View. } private void dataGridView1_SelectionChanged(object sender, EventArgs e) { //if (index > 0) { // int selectedIndex = dataGridView1.SelectedRows[0].Index; //CopyColumns(); //for (int i = 0; i // dataGridView2.Rows[0].Cells[i].Value = dataGridView1.Rows[selectedIndex].Cells[i].Value; //} } //void CopyColumns() //{ // for (int i = 0; i // dataGridView2.Columns.Add(i.ToString(), dataGridView1.Columns[i].HeaderText); //} private void dataGridView1_CellEnter(object sender, DataGridViewCellEventArgs e) { } private void dataGridView1_CellContentDoubleClick(object sender, DataGridViewCellEventArgs e) { if (index > 0) { int selectedIndex = dataGridView1.SelectedRows[0].Index; CopyColumns(); for (int i = 0; i dataGridView2.Rows[0].Cells[i].Value = dataGridView1.Rows[selectedIndex].Cells[i].Value; } } void CopyColumns() { for (int i = 0; i dataGridView2.Columns.Add(i.ToString(), dataGridView1.Columns[i].HeaderText); } } }

Dharmraj Thakur · Answer

You are accessing array element which is not present or which is out of array limit.
Example:
int[] a = new int[2];
int[0] = 1; //ok
int[1] = 2; //ok
int[2] = 3; //throw array index out of bound