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POwhy aren't my buttons working in c# application
 

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  1. POwhy aren't my buttons working in c# application
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    <p>I have a form which is linked to a database and the buttons which control the form are not working, I'm not getting any errors just simply nothing is happening. </p> <p>DisplayRow class </p> <pre><code>private void DisplayRow(int rowIndex) { // Check that we can retrieve the given row if (myDataTable.Rows.Count == 0) return; // nothing to display if (rowIndex &gt;= myDataTable.Rows.Count) return; // the index is out of range // If we get this far then we can retrieve the data try { DataRow row = myDataTable.Rows[rowIndex]; textBox1.Text = row["FilePath"].ToString(); textBox2.Text = row["Subject"].ToString(); textBox3.Text = row["Title"].ToString(); textBox4.Text = row["Keywords"].ToString(); textBox5.Text = row["MediaType"].ToString(); } catch (Exception ex) { MessageBox.Show("Error in DisplayRow : \r\n" + ex.Message); } } </code></pre> <p>The button which should move on to the next record</p> <pre><code>private void button1_Click(object sender, EventArgs e) { if (currentRecord &lt; myDataTable.Rows.Count -1) { currentRecord++; DisplayRow(currentRecord); } </code></pre> <p>But like i say when i run the app nothing happens, no errors just nothing.</p> <p>EDIT: as asked the coded for MyDataTable</p> <pre><code>private void Form1_Load(object sender, EventArgs e) { { String command = "SELECT * FROM Media"; try { myConnection = new OleDbConnection(access7ConnectionString); myAdapter = new OleDbDataAdapter(access7ConnectionString, myConnection); myCommandBuilder = new OleDbCommandBuilder(myAdapter); myDataTable = new DataTable(); FillDataTable(command); DisplayRow(currentRecord); } catch (Exception ex) { MessageBox.Show(ex.Message); } } </code></pre> <p>full code what I am running..</p> <pre><code>using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.Data.OleDb; namespace MediaPlayer { public partial class Media : Form { // Use this connection string if your database has the extension .accdb private const String access7ConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\MediaDatabase.accdb"; // Use this connection string if your database has the extension .mdb private const String access2003ConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|\MediaDatabase.mdb"; // Data components private DataTable myDataTable; // Index of the current record private int currentRecord = 0; private void FillDataTable(string selectCommand) { currentRecord = 0; OleDbConnection myConnection = new OleDbConnection(access7ConnectionString); OleDbDataAdapter myAdapter = new OleDbDataAdapter(selectCommand, myConnection); myDataTable = new DataTable(); try { myConnection.Open(); myAdapter.SelectCommand.CommandText = selectCommand; myAdapter.Fill(myDataTable); myConnection.Close(); } catch (Exception ex) { MessageBox.Show("Error in FillDataTable : \r\n" + ex.Message); } DisplayRow(currentRecord); } private void DisplayRow(int rowIndex) { // Check that we can retrieve the given row if (myDataTable.Rows.Count == 0) return; // nothing to display if (rowIndex &gt;= myDataTable.Rows.Count) //resets the index to 0 when you get past the last record rowIndex = 0; //if rowIndex is less then 0 set it to the last row if (rowIndex &lt; 0) rowIndex = myDataTable.Rows.Count - 1; // If we get this far then we can retrieve the data try { DataRow row = myDataTable.Rows[rowIndex]; textBox1.Text = row["FilePath"].ToString(); textBox2.Text = row["Subject"].ToString(); textBox3.Text = row["Title"].ToString(); textBox4.Text = row["Keywords"].ToString(); textBox5.Text = row["MediaType"].ToString(); } catch (Exception ex) { MessageBox.Show("Error in DisplayRow : \r\n" + ex.Message); } } public Media() { InitializeComponent(); string command = "SELECT * FROM Media"; //the try catch is in the FillDataTable method FillDataTable(command); } private void label2_Click(object sender, EventArgs e) { } private void button2_Click(object sender, EventArgs e) { //assuming this cycles through the data currentRecord++; DisplayRow(currentRecord); } private void button6_Click(object sender, EventArgs e) { //assuming this resets the data currentRecord = 0; this.DisplayRow(currentRecord); } private void button1_Click(object sender, EventArgs e) { //assuming this cycles through the data currentRecord++; DisplayRow(currentRecord); } } </code></pre> <p>}</p>
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    1. USJoshua Hornby
    1. USJoshua Hornby
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    1. This table or related slice is empty.
    1. COIs button1_click actually being fired?
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      1. POwhy aren't my buttons working in c# application
      1. USMartW
    2. COWell did you try placing breakpoints maybe the if is evaluating to false ?
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      1. POwhy aren't my buttons working in c# application
      1. USV4Vendetta
    3. COdid you put some breakpoint somewhere ?
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      1. POwhy aren't my buttons working in c# application
      1. USFelice Pollano
 

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