//Method to update data in database from our application
public bool Update(contactClass c)
{
//Create a default return type and set its default value to false
bool isSuccess = false;
SqlConnection conn = new SqlConnection(myconnstrng);
try
{
//SQL to update data in our Database
string sql = "UPDATE tbl_contact SET FirstName=@FirstName, LastName=@LastName, ContactNo=@ContactNo, Address=@Address, Gender=@Gender WHRER Contact=@ContactID";
//Creating SQL Command
SqlCommand cmd = new SqlCommand(sql, conn);
//Create Parameters to add value
cmd.Parameters.AddWithValue("@FirstName", c.FirstName);
cmd.Parameters.AddWithValue("@LastName", c.LastName);
cmd.Parameters.AddWithValue("@ContactNo", c.ContactNo);
cmd.Parameters.AddWithValue("@Adress", c.Address);
cmd.Parameters.AddWithValue("@Gender", c.Gender);
cmd.Parameters.AddWithValue("@ContactID", c.ContactID);
//Open Database Connection
conn.Open();
int rows = cmd.ExecuteNonQuery();
//if the query runs succfully then the value of rows will be 0
if (rows > 0)
{
isSuccess = true;
}
else
{
isSuccess = false;
}
}
catch (Exception)
{
}
finally
{
conn.Close();
}
return(isSuccess);
}
//Inserting Datainto Database
public bool Insert(contactClass c)
{
//Creating a default return type and setting its value to false
bool isSuccess = false;
//Step 1: Connect Database
SqlConnection conn = new SqlConnection(myconnstrng);
try
{
//Step 2: Create a SQL Query to insert Data
string sql = "INSERT INTO tbl_contact (FirstName, LastName, ContactNo, Address, Gender) VALUES (@FirstName, @LastName, @ContactNo, @Address, @Gender)";
//Creating SQL Command using sql and conn
SqlCommand cmd = new SqlCommand(sql, conn);
//Create Parameters to add data
cmd.Parameters.AddWithValue("@FirstName", c.FirstName);
cmd.Parameters.AddWithValue("@LastName", c.LastName);
cmd.Parameters.AddWithValue("@ContactNo", c.ContactNo);
cmd.Parameters.AddWithValue("@Address", c.Address);
cmd.Parameters.AddWithValue("@Gender", c.Gender);
//Connection Open here
conn.Open();
int rows = cmd.ExecuteNonQuery();
//If the query runs successfully then the value of rows will be greater than zero else its value will be 0
if (rows > 0)
{
isSuccess = true;
}
else
{
isSuccess = false;
}
}
catch (Exception)
{
}
finally
{
conn.Close();
}
return(isSuccess);
}
//Method to Delete Data from Database
public bool Delete(contactClass c)
{
//Create a default return value and set its value to false
bool isSuccess = false;
//Create SQL Connection
SqlConnection conn = new SqlConnection(myconnstrng);
try
{
//SQL To Delete Data
string sql = "DELETE FROM tbl_contact WHERE ContactID=@ContactID";
//Creating SQL Command
SqlCommand cmd = new SqlCommand(sql, conn);
cmd.Parameters.AddWithValue("@ContactID", c.ContactID);
//Open Connection
conn.Open();
int rows = cmd.ExecuteNonQuery();
//if the query run secessfully then the value of rows is greater than 0 else its value is 0
if (rows > 0)
{
isSuccess = true;
}
else
{
isSuccess = false;
}
}
catch (Exception)
{
}
finally
{
//Close Connection
conn.Close();
}
return(isSuccess);
}
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
a = Factory.Create(comboBox1.Text);
}