Must declare the scalar variable "@tdtext".

Question

namespace TDApplication

{

public partial class Contactform : Form

{

SqlConnection con = new SqlConnection("Data Source=.\\SQLEXPRESS;Initial Catalog=TDApplication;Integrated Security=true;");

SqlCommand cmd;

//ID variable used in Updating and Deleting Record

int ID = 0;

//int ID = @tdtext;

//////int ID = tdtext.Text;

public Contactform()

{

InitializeComponent();

DisplayData();

ClearData();

}

//Insert Data

private void btn_Insert_Click(object sender, EventArgs e)

{

if (TitalcomboBox.Text != "" && NametxtBox.Text != "")

{

cmd = new SqlCommand("insert into TDContact ( Title,Name,H_Phone,C_Phone,W_Phone,Address,City,State,Pin_code,P_Email,W_Email,Gender,Birthday,Marriage) VALUES (@Title,@Name,@H_Phone,@C_Phone,@W_Phone,@Address,@City,@State,@Pin_code,@P_Email,@W_Email,@Gender,@Birthday,@Marriage)", con);

con.Open();

cmd.Parameters.AddWithValue("@Title", this.TitalcomboBox.Text.Trim());

cmd.Parameters.AddWithValue("@Name", this.NametxtBox.Text.Trim());

cmd.Parameters.AddWithValue("@H_Phone", this.HPtxtBox.Text.Trim());

cmd.Parameters.AddWithValue("@C_Phone", this.CPtxtBox.Text.Trim());

cmd.Parameters.AddWithValue("@W_Phone", this.WPtxtBox.Text.Trim());

cmd.Parameters.AddWithValue("@Address", this.AddrstxtBox.Text.Trim());

cmd.Parameters.AddWithValue("@City", this.CitytxtBox.Text.Trim());

cmd.Parameters.AddWithValue("@State", this.StatecomboBox.Text.Trim());

cmd.Parameters.AddWithValue("@Pin_code", this.PintxtBox.Text.Trim());

cmd.Parameters.AddWithValue("@P_Email", this.PEmailtxtBox.Text.Trim());

cmd.Parameters.AddWithValue("@W_Email", this.WEmailtxtBox.Text.Trim());

cmd.Parameters.AddWithValue("@Gender", this.GendrcomboBox.Text.Trim());

cmd.Parameters.AddWithValue("@Birthday", this.dateTimePicker1.Value);

cmd.Parameters.AddWithValue("@Marriage", this.dateTimePicker2.Value);

cmd.ExecuteNonQuery();

con.Close();

MessageBox.Show("Record Inserted Successfully");

DisplayData();

ClearData();

}

else

{

MessageBox.Show("Please Provide Details!");

}

}

//Display Data in Listview

private void DisplayData()

{

listView1.View = View.Details;

SqlDataAdapter ada = new SqlDataAdapter("select ID, Title,Name,Address from TDContact", con);

DataTable dt = new DataTable();

ada.Fill(dt);

listView1.Items.Clear();

foreach (DataRow row in dt.Rows)

{

ListViewItem item = new ListViewItem(row["ID"].ToString());

item.SubItems.Add(row["Title"].ToString());

item.SubItems.Add(row["Name"].ToString());

item.SubItems.Add(row["Address"].ToString());

listView1.Items.Add(item);

}

}

//Clear Data

private void ClearData()

{

TitalcomboBox.Text = "";

NametxtBox.Text = "";

HPtxtBox.Text = "";

CPtxtBox.Text = "";

WPtxtBox.Text = "";

AddrstxtBox.Text = "";

CitytxtBox.Text = "";

StatecomboBox.Text = "";

PintxtBox.Text = "";

PEmailtxtBox.Text = "";

WEmailtxtBox.Text = "";

GendrcomboBox.Text = "";

dateTimePicker1.Text = "";

dateTimePicker2.Text = "";

ID = 0;

}

//Update Record

private void btn_Update_Click_1(object sender, EventArgs e)

{

cmd = new SqlCommand("update TDContact set Title=@Title,Name=@Name,H_Phone=@H_Phone,C_Phone=@C_Phone,W_Phone=@W_Phone,Address=@Address,City=@City,State=@State,Pin_code=@Pin_code,P_Email=@P_Email,W_Email=@W_Email,Gender=@Gender,Birthday=@Birthday,Marriage=@Marriage where tdtext.Text = @id ", con);

con.Open();

cmd.Parameters.AddWithValue("@id", tdtext.Text);

cmd.Parameters.AddWithValue("@Title", this.TitalcomboBox.Text.Trim());

cmd.Parameters.AddWithValue("@Name", this.NametxtBox.Text.Trim());

cmd.Parameters.AddWithValue("@H_Phone", this.HPtxtBox.Text.Trim());

cmd.Parameters.AddWithValue("@C_Phone", this.CPtxtBox.Text.Trim());

cmd.Parameters.AddWithValue("@W_Phone", this.WPtxtBox.Text.Trim());

cmd.Parameters.AddWithValue("@Address", this.AddrstxtBox.Text.Trim());

cmd.Parameters.AddWithValue("@City", this.CitytxtBox.Text.Trim());

cmd.Parameters.AddWithValue("@State", this.StatecomboBox.Text.Trim());

cmd.Parameters.AddWithValue("@Pin_code", this.PintxtBox.Text.Trim());

cmd.Parameters.AddWithValue("@P_Email", this.PEmailtxtBox.Text.Trim());

cmd.Parameters.AddWithValue("@W_Email", this.WEmailtxtBox.Text.Trim());

cmd.Parameters.AddWithValue("@Gender", this.GendrcomboBox.Text.Trim());

cmd.Parameters.AddWithValue("@Birthday", this.dateTimePicker1.Value);

cmd.Parameters.AddWithValue("@Marriage", this.dateTimePicker2.Value);

cmd.ExecuteNonQuery();

con.Close();

if (ID != 0)

{

MessageBox.Show("Record Updated Successfully");

DisplayData();

ClearData();

}

else

{

MessageBox.Show("Please Select Record to Update");

}

}

// Select Listview Index

private void listView1_SelectedIndexChanged(object sender, EventArgs e)

{

if (listView1.SelectedItems.Count == 0)

return;

ListViewItem item = listView1.SelectedItems[0];

ID = Convert.ToInt32(listView1.SelectedItems[0].SubItems[0].Text);

TitalcomboBox.Text = listView1.SelectedItems[0].SubItems[1].Text;

NametxtBox.Text = listView1.SelectedItems[0].SubItems[2].Text;

//HPtxtBox.Text = listView1.SelectedItems[0].SubItems[3].Text;

//CPtxtBox.Text = listView1.SelectedItems[0].SubItems[4].Text;

//WPtxtBox.Text = listView1.SelectedItems[0].SubItems[5].Text;

//AddrstxtBox.Text = listView1.SelectedItems[0].SubItems[6].Text;

//CitytxtBox.Text = listView1.SelectedItems[0].SubItems[7].Text;

//StatecomboBox.Text = listView1.SelectedItems[0].SubItems[8].Text;

//PintxtBox.Text = listView1.SelectedItems[0].SubItems[9].Text;

//PEmailtxtBox.Text = listView1.SelectedItems[0].SubItems[10].Text;

//WEmailtxtBox.Text = listView1.SelectedItems[0].SubItems[11].Text;

//GendrcomboBox.Text = listView1.SelectedItems[0].SubItems[12].Text;

//dateTimePicker1.Text = listView1.SelectedItems[0].SubItems[13].Text;

//dateTimePicker2.Text = listView1.SelectedItems[0].SubItems[14].Text;

}

//Delete Record

private void btn_Delete_Click_1(object sender, EventArgs e)

{

if (ID != 0)

{

cmd = new SqlCommand("delete TDContact where tdtext.Text=@id", con);

con.Open();

cmd.Parameters.AddWithValue("@id", tdtext.Text);

cmd.ExecuteNonQuery();

con.Close();

MessageBox.Show("Record Deleted Successfully!");

DisplayData();

ClearData();

}

else

{

MessageBox.Show("Please Select Record to Delete");

}

}

// hidden TextBox onclick event

private void tdtext_TextChanged(object sender, EventArgs e)

{

SqlDataAdapter ada = new SqlDataAdapter("select ID, Title,Name,H_Phone,C_Phone,W_Phone,Address,City,State,Pin_code,P_Email,W_Email,Gender,Birthday,Marriage from TDContact Where ID = '"+ tdtext.Text+"' ", con);

}

}

}